Doepfer SK2000 Midi Masterkeyboard (device no longer available) - Manual (Page 21)

User's Guide SK2000 Page 21
Layer Sounds (two simultaneous sounds)
When the same MIDI channel is assigned to both parts one obtains two simultaneous sounds (layer
sounds). In this case both parts of the internal XG sound card respond when playing on the keyboard. Even
though the internal XG card has available 16 parts the SK2000 only uses the parts 1 and 2 of the XG card.
This has to be considered if external MIDI messages are used to play the SK2000 sounds. External MIDI
messages are mixed with the messages generated by the SK2000 and passed on to the XG card. In this
way it may happen that both messages affect or cancel each other.
On the other hand this may be used to play triple or even quad layer sounds with the SK2000. One simply
has to assign MIDI channels 3 ... 16 to the parts 1 and 2. In this case the XG card receives additional note
information on the 2 new channels. Unfortunately it is not possible to adjust these additional sounds with the
SK2000. Without an external editor one always is limited to the sound after power on, i.e. Grand Piano for
channel 3..9 and 11...16 resp. Drum Set for channel 10. Therefore an external editor software is
recommended (or even necessary) in case of triple or quad layer sounds. But as the sound card has only
32 voices available it is doubtful if triple or quad layers really make sense.