Hi,
traduced this from the german roland site:
1. Turn VP-7 off
2. Press and hold buttons BYPASS and VOCODER and turn VP-7 on. After that it will display the actual channel setting (look table below)
3. Press the desired button(s) to set your channel or BYPASS to exit this setting mode
4. Release the buttons (I think BYPASS and VOCODER), the setting flashes 2 times according to the table below.
The channel setting remains even after turning the VP-7 off.
Table of MIDI-channels
-------------------------------------------------------------
Channel setting [button] | channel display (LED colors)
_______________________________________________________________
01 | [Female Choir] | [Female Choir](red)
02 | [Kids Choir] | [Kids Choir](red)
03 | [Gregorian Choir] | [Gregorian Choir](red)
04 | [Jazz Scat Choir] | [Jazz Scat Choir](red)
05 | [Female Choir]+[Duet] | [Female Choir](red)+[Duet](green)
06 | [Kids Choir]+[Duet] | [Kids Choir](red)+[Duet](green)
07 | [Gregorian Choir]+[Duet] | [Gregorian Choir](red)+[Duet](green)
08 | [Jazz Scat Choir]+[Duet] | [Jazz Scat Choir](red)+[Duet](green)
09 | [Female Choir]+[Trio1] | [Female Choir](red)+[Trio1](green)
10 | [Kids Choir]+[Trio1] | [Kids Choir](red)+[Trio1](green)
11 | [Gregorian Choir]+[Trio1] | [Gregorian Choir](red)+[Trio1](green)
12 | [Jazz Scat Choir]+[Trio1] | [Jazz Scat Choir](red)+[Trio1](green)
13 | [Female Choir]+[Trio2] | [Female Choir](red)+[Trio2](green)
14 | [Kids Choir]+[Trio2] | [Kids Choir](red)+[Trio2](green)
15 | [Gregorian Choir]+[Trio2] | [Gregorian Choir](red)+[Trio2](green)
16 | [Jazz Scat Choir]+[Trio2] | [Jazz Scat Choir](red)+[Trio2](green)
Omni | see user manual | All Sound buttons flash red.
Hope this helps. The table gets distorted when posted, sorry!