VR Bugs, Tips & Tricks

[TIP] Periodic Cleaning and Maintenance

VR09/730 are workhorses. They are solid but periodic (monthly/seasonal/annual) maintenance can extend lifetime and avoid e.g. contact problems that (Murphys Law) poppup while you’re in a plain solo in front of 1500 people :). Regular cleaning will also prevent dust to crawl in between the key contacts causing ‘key fails’

Dust, Dirt, Grease:

  • clean: a ‘textile’ fabric (e.g. fleece towel – don’t use paper towels as they cause scratches) and a bit of glass (windows) cleaner (or ‘PC display cleaning liquid’) for cleaning the housing, the display and the keys.
  • dust prevention: use dust covers. A zero-cost solution is a simple plastic tarpaulin (see GEAR)
  • dust cleaning: when you hoover your apartment, spend two minutes on your VR: use the crevice or brush nozzle and hoover “between the keys” to get out dust from the inside
  • dust maintenance: every 2 years (in a dusty environment once a year) open the VR, use a vacuum cleaner to get out dust, breadcrumbs, hair, eyebrows, tobacco, fingernails… carefully whipe-off coke, beer, coffee, etc

Electrics (faders, pots, switches)

Faders, pots, etc can fail by ‘use’, dust or oxidation. For a ‘young board’ like the VRs, use and oxidations are quite unlikely and dust’ is the common reason for electric contact problems. Dust can affect the (drawbar) faders, the potentiometers (‘knobs’) and the key contacts.

N E V E R use aggressive electric cleaners (e.g. for car electrics like KONTAKT-60). These cleaners will initially do a monster clean – followed by a longterm destruction of electrical components. If you accidentally have used aggressive cleaner, flush the involved parts (fader/switches/boards/connectors…) with pure alcohol.
N E V E R use thinners or acetone: these can destroy (printed) electrical boards within seconds and also dissolve plastic parts (exception: ‘VR09 key mod by acetone’…). For cleaning electrical boards, use pure alcohol (Isopropanol) .
N E V E R use spray oils like WD-40: these have aggressive components (for dissolving rust) that can cause corrosion to electrical components. Those oils also ‘wander’ on the boards and finally will cover larger areas.

For cleaning and ‘deoxidating’ petentionmeters, faders, switches etc. only use soft ‘electronic contact cleaners’ (note the difference: not ‘electric’ but ‘electronic’) Good and reasonably priced: Oszillin Teslanol T6. US boys swear on ‘Caig DeoxIT’ products (expensive as golden ‘fabricated-in-donkey-blood-at-full-moon’ Voodoo-HIFI cables)

Once a year you should maintain the drawbar faders with electronic contact cleaner. Use the spray nozzle to push a tiny amount of cleaner through the fader slit into the fader pot
In case of serious contact problems (very dirty faders), open the VR, remove the electronic board with faders, massively flush the fader potentiometers with contact cleaner until all dirt is washed out out. Clean (dry) the boards with paper towels
After cleaning you can lubricate faders/pots: use a tiny amount of electronic lubrification spray (e.g. KONTAKT-61, DeoxIT Fader Lube). Don’t use grease or oil : this will collect and bind dust.

[TIP] Scratchy volume knob

The VR volume pot is known for contact troubles (turning the pot adds a scratch noise to the sound).
Pull the knob hat off (carefully slide a knife between knob and housing, then lift it slowly without force). Spray a tiny amount of contact clearner (see ‘electrics maintenance’) along the shaft and turn the pot ca. 30 times, switch VR on and test if the ‘scratch noise’ has disappeared. If not, repeat. If still scratchy, open the VR, undo the board with the volume knob, flush the potentiometer with a heavy dose of contact spray (protect the board with a kitchen towel from flooding everything with contact spray)

[BUG] VR730: ‘USB cable disconnected’ message

Out of Nirvana, VR730 repeats showing an annoying ‘USB cable disconnected’ error screen that only can be closes by pushing the ‘exit’ button
There are no reports of successfull DIY analysis or repairs. We propose to open the VR730, test cables from/to the electric USB board, test the board for (micro) cracks, etc. etc.

[BUG] VR730: USB drives cannot be inserted

There had been repeated reports that USB thumb drive do not fit into the socket of VR730.
There are no reports of successfull DIY repairs. It might be a VR build series with corrupt sockets, or sockets damaged by protuding thumb drives… We disrecommend any attempt to ‘force’ thumb drives into the socket. Eventually use a headlight to inspect the inner of the socket, search for sticking parts of old broken sticks, etc.

[TIP] VeAr Combos Flying Faders

Not a real hardware problem but annoying when it happens: fader (drawbars) caps become lose (especially when used a lot) very easily popp of – and are gone. Some DIY-men fix them with glue (con: it’s not possible anymore to take the electric board off for repair without destroying the faders).

[TIP] ‘Damaged’ Sounds (aka power supply)

If the VR starts emitting heavily disturbed sounds, in most cases the power supply is dying. Test: run VR on batteries, if problems are gone, it’s the supply. Replace by Roland spare parts, any generic CV adaptor, or a ‘Ripcord’ USB adaptor

[TIP] Layer / split with 2 sounds of same group

Howto create a layer or split with sounds of the same group (e.g. layering 2 acoustic pianos from PIANO group):

  • create a layer (split) ‘as usual’ with 2 sounds from 2 groups (e.g. by pressing PIANO + E.PIANO sound selector buttons)
  • use the CURSOR buttons to step in the display to the sound of which you want change the group (here the E.PIANO sound)
  • now press the sound selector button of the 1st group (‘PIANO’) and use the cursors or dial to select the desired instrument (a.g. a 2nd piano)

[TIP] Using ‘PK Pedal’ socket as (addtional) Midi-In for bass

The ‘PK IN’ socket (for attaching a Roland PK organ pedal) works as a normal 5-pin Midi-in socket for the ‘bass’ section of the VR. You can plug any midi controller (midi keyboard, midi organ pedal, sequencer etc) into the socket using an ordinary 5-pin midi cable (this does NOT cause any harm) to play VR organ bass or ‘zone 4’ (‘bass zone’) set up with CTRLR EDITOR.

[TIP] Connect a midi keyboard (controller) to VR via USB-midi

See MIDI, end of page

[BUG] Pitch Bend stepping

VR has resolution’ bugs in the pitch bend by VR lever (joystick) and D-Beam:
a) initial stepping of joystick after ‘VR startup’:
the first time one uses the pitch joystick it makes ‘giant’ steps, e.g. pushing to left steps 2 minor seconds – or sometimes 1 major second. After this ‘first usage’ the stepping returns to ‘normal’ – what VR considers as ‘normal’ (see b).
b) ‘regular stepping’ of joystick and D-Beam:
for each direction, ‘joystick-bend’ is split into (maximal) 14 steps, ‘D-Beam-bend’ into 35 steps – the correct standard resolution for pitch bend should be 16383 (!) steps
   – Joystick: 14 steps for pitch up, 10-14 steps for pitch down (number is not constant)
   – D-Beam: 35 steps for pitch up, 35 steps for pitch down
For a halftone or tone bend range, the steppping is noticable when listening carefully but can be ignored in a live context
For lager bend ranges the stepping makes the joystick unusable: for +/- 1 octave, a pitch sweep is broken into quasi halftone steps


  1. INITIALIZE: after switching the VR on, move the joystick once left/right to ‘normalise’ the stepping (from 1/2 steps to at least 14 steps …)
  2. D-BEAM: D-beam ‘pitch’ resolves into 35 steps for each direction – a bit better than the joystick. Note:
        – ‘pitch bend RANGE’ setting ( VR Menu ‘CONTROL’) also applies to the D-beam pitch
        – D-Beam ‘standard’ has only ‘pitch down’: to perform pitch up:
              – cover the D-Beam, press the ‘final note’, then lift the hand
              – or use CTRLR EDITOR to set D-Beam ‘pitch up’ (‘hidden setting that saves to VR registrations)
  3. PORTAMENTO: in certain cases, VR portamento (from VR Menu) may be used instead of pitch bend. It is ‘continuous’ and can shift any interval (several octaves)
  4. MIDI: VR is very well capable of high resolution pitch bend: pitch bend send via midi (“En ll mm”-message) works flawlessly. So you can use the pitch lever/wheel of an external key or midi controller midied into the VR

[BUG] Organ ‘note retrigger bug’:

When playing the same organ tone on different keys one key retriggers (restarts) the other (both on lower key press and release). This generates ‘false key-clicks’ and gets extremely disturbing when playing with both hands, adding a kind of ‘clatter noise’ (like dirty key contacts on vintage organs). It’s not much of a problem when playing simple chords or ‘monophonic solos’ but becomes serious for any jazz or ‘enhanced rock’ playing (n.b. this bug already appeared in previous VR organ engines)

The most simple ‘constellation’ is e.g. using drawbar 8″ on lower and upper manuals and playing the same note (e.g. C4) on each manual: while holding note C4 on upper, each time of pressing and releasing C4 on lower restarts (retriggers) the upper tone which produces ‘non played’ key klicks
The effect appears with any combination of ‘equal tones (frequencies)’, eg. between drawbars 4″ and 8″ played with 1 octave difference or with harmonic drawbars (e.g. 5 1/2 + 8) as long as the same note is played. It happens not only between lower and upper manual but also within a single manual – where it is less pronounced.

Organ is set to e.g. 8″ drawbar, audio signal is recorded (Audacity): in both examples, note C is hold. In the upper example, an additional ‘non-C’ note is played (e.g. ‘E’): both notes overlay normally. In the 2nd example, the exactly same C is played again (e.g. on the lower manuall with the same drawbar): at each key press and lift, this ‘2nd C’ causes a short interrupt of the first C. The interrupts produce a ‘clic’ or ‘tap’ noise that becomes very annoying with more identical tones (drawbars mix) and polyphonic playing.

Most simple solution: you’re one of those that don’t hear the ‘clicking’ – or even if, don’t feel pertubated.
If it’s not you, the simple solution – try to limit overlapping of drawbars between lower and upper: avoid ‘higher harmonic’ drawbars in lower manual and play it in a different tone range than upper (rather like an organ bass). Avoid 2-handed polyphone playing (as each ‘lower key hit’ will retrigger upper manual tones or entire chords)

[BUG] Organ Level is not correctly saved in VR registration

The bug appears mainly with ‘mixed registrations’ (organ + other sound) but, under certain conditions, also in ‘pure organ’ registrations:
When using VR organ, the value of the LEVEL fader (adjusting the organ volume) is not correctly saved to VR registrations and defaults back to ’10’ when the registration is recalled.
a) leave LEVEL at default 10, instead use ‘organ Low/High Gain’ of VR menu ‘Organ’ to in(de)crease organ volume : when both parameters are rised/lowered to the same value, the spectral distribution is un-changed: and organ with Low- and High gain at -12 sounds exactly like having both at +12 – it just differs in volume
b) use CTRLR EDITOR and ise the ‘volume bar’ below the ‘organ voice’ – then save to VR registration (ctrlr editor sets a special ‘hidden’ VR parameter for organ volume that luckily also saves to VR registrations and is recognized on registraion load)

[BUG] Seamless transission works with sound artefacts

In firmware 1.03 ‘seamless transistion’ was added to VR. That means changing a patch or registration does not cut off the previous sound – this is a very nice feature e.g. when hopping from a sustained piano to e.g. a brass sound: the sustain of the piano keeps on decaying and is not cut off.
Unfortunately the realisation was half-hearted: while the previous sound ‘keeps sounding’ , the EFX settings of the new patch are applied to it. Example: you play sustained acoustic piano, and switch to ‘Tremolo EP’: then the still out-fading tones of the accoustic piano suddenly also ‘get tremoloed’.
The sudden change of EFX can lead to more severe sound artefacts, even ‘loud bangs’ during performance.

– songs hat have ‘patch changes’ : try to limit the use of EFX
– use the 4 zones of VR instead of patch-switching.
– if you hear heavy EFX artefacts (‘bangs’) between switching patches, mute the VR for the moment of the ‘switch’ using the expression pedal

[TIP] Exploring and Exploiting MFX ‘Twin-Rotary’

MFX TwinRotary is an interesting effect that has many ‘inner values’ and allows polyvalent ‘applications’, e.g. as ‘yet another Leslie’, chorus-type, tremolo, LFO etc
TwinRotary is directly coupled to all Rotary options (fast/slow, woofer/twetter acceleration and speed, and even ‘rotary type’) – it does not matter if ‘rotary on/off’ is on or off – even with rotary OFF, the options of ‘Rotary’ and speed control apply to TwinRotary – which makes it more customisable than any other VR effect

Examples: one can…

  • use TwinRotary as Leslie for ‘pure Tonewheel sound’ (VR organ without engaging the ‘Rotary AMPs’):
    set rotary-on/off to OFF. Set MFX to TwinRotary and turn it on. In VR menu ‘Rotary’, customise type, ramps, speeds
    use fast/slow button or joystick to switch rotary speed
  • use TwinRotary as Leslie for any sound, avoiding to distort the sound through any’Rotary Amp’ :
    set rotary-on/off to OFF. Set MFX to TwinRotary and turn it on. In VR menu ‘Rotary’, customise type, ramps, speeds
    use fast/slow button to switch rotary speed
  • add a Multi-Dim-Chorus’- like effect to e.g. a synth sound – with customisable amplitude – AND reate AND character:
    set rotary-speed to ‘fast’ (enlighted position is used as ‘effect ON’)
    set rotary-on/off to OFF. Set MFX to TwinRotary and turn it on. In VR menu ‘Rotary’, customise type, ramps, speeds:
        – select type for a more ‘mono’ or more ‘spacy’ effect
        – set all ‘ramps’ to 127
        – set woofer/tweeter ‘slow speeds’ to 0 (this allows to turn the effect off by switching rotary to ‘slow’)
        – adjust (detune) woofer/tweeter ‘fast speeds’ in the range of 10-20 to optimise a ‘spacy effect
    adust MFX knob for the right amount of the MFX
  • add a Tremolo-(LFO)-Effect ‘customisable’ in rate AND amplitude to any sound, e.g. EPs.
    This ‘trick’ makes use of the ‘tremolo component’ that is part of any Leslie sound:
    set rotary-speed to ‘fast’ (enlighted position is used as ‘effect ON’)
    set rotary-on/off to OFF. Set MFX to TwinRotary and turn it on. In VR menu ‘Rotary’, customise type, ramps, speeds:
        – select type: type 2 produces a stereo-tremolo, type 1 and 3 tend towards mono-tremolo
        – set all ‘ramps’ to 127
        – set woofer/tweeter ‘slow speeds’ to 0 (this allows to turn the effect off by switching rotary to ‘slow’)
        – set woofer/tweeter ‘fast speeds’ to a (identical) value in the range of 80-100
    adust MFX knob for the right amount of the MFX
  • add a ‘stereo-spread’ effect to any sound by using TwinRotary at ‘Rotary stop’:
    set rotary-on/off to OFF. Set MFX to TwinRotary and turn it on. In VR menu ‘Rotary’, customise type, ramps, speeds:
        – select type: types produce different types of ‘spacing’
        – set all ‘ramps’ to 127
        – set woofer/tweeter ‘slow and fast speeds’ to 0
    use MFX knob to tune the amount of the effect


VR has no ‘local off’ (used when controlling external midi sound generators)
Instead use VR registrations: select e.g. ‘piano’ and set its LEVEL to 0. Midi ‘note-on/off’ is not affected by level and is sending normal velocity values.
Users of CTRLR EDITOR can simply switch all ‘voices’ off (instead of setting level 0) .

This method also applies to splitted keybed (VR default-split or CTRLR EDITOR multi-zones).
You can buld ‘complex setups’ of zones playing VR sounds and zones playing external modules – or zones ‘layering’ both (eventually change VRs TX midi channels to suit the modules), and each ‘setup’ can be saved to a registration.

[TIP] MONO vs. STEREO amping

The VR is NOT good at mono-sounds. While some high spec keyboards use specially recorded ‘real mono samples’ on ‘Line-out L/Mono’, the VR just summs the 2 stereo R+L signals into a mono signal.
The problem is that stupid summation of stereo R+L produces so called ‘interferences’: frequency ranges can be wiped out whereas others are overemphasized, and so called ‘beats’ (like a slow chorus effect) can appear.
The result is that, when running the VR only through Lineout L/Mono, particulary acoustic pianos (but also other stereo sample sounds) becomes heavily distorted.
Unfortunately the VR “MONO PIANO” patch is not a real mono recording either: it’s obvious hat Roland simply summed one of their stereo-pianos.
For this reason it’s highly recommended to use the VR always in STEREO – 2 separate speakers or at least a ‘twin amp’. See Amps, Monitors, etc for examples

[TIP] Beer Desaster Recovery

Only one story could close the V-Combos ‘TIPs’ chapter – the most feared leathal attack to keyboards in keyboard history ever:
THE BEER BOMB (or: coffee, orange juce, cat wee …)

Immediatly switch the key off, if possible unplug the power cord to prevent internal shortcuts
Open the VR (see v-combo website specials), unmount the affected parts
Clean boards/components in your shower, dab them dry with paper towels, and flush them with destilled water, again dab them dry with with paper towels
Finally flush the boards with pure alcohol (isopropanol) which binds and takes away remaining traces of water
Let the boards dry for some days
During reassembling spray some (soft!) electronic cleaner into the pots, faders and wire connectors