@leeboy
No matter how hard you try: switching voices with different DSPs on the same part (= midi channel) is always asking for trouble on ANY Yamaha arranger. Genos included.
The sound generator will "immediately" apply the new DSP processing to the audio coming out from that channel.
Even if you released the keys before switching the voice (manually, via OTS, via Registration, it does not matter) the decaying part of the dying notes will still produce a sound that will be picked up by the new DSP,
even if you do not play any new note.
If the new DSP is set to amplify enough the signal or apply feedback (i.e.: Guitar stomp box with distortion. compressor, delay) you end up with nasty and unwanted noises.
It is a lost cause. There is nothing you can do, except to blame Yamaha.
To add insult to injury, many DSP effects are applied with a small (but noticeable, probably in the 100ms range) delay. This means that if you change the DSP and then immediately play a note, the new note attack is cut until the DSP effect catches up (probably an internal delay line whose buffer must be filled before something can come out from the effect).
This is super annoying too. Although less noticeable because most people do NOT play a note immediately after switching the DSP.
* * *
If you want to ELIMINATE the problem once for all and be free to play and switch OTS when you like, glitch free, you should try our software
Groovyband Live!. There is a free demo. It perfectly complements your hardware because it is
designed to work with Yamaha arrangers.
In addition you can stack 2 insert DSPs per part, and use all the DSPs you have in whatever part you wish. And enjoy literally
hundreds of other advanced features your Yamaha firmware simply does not give you.
To learn more you can check our website or also read a few threads on this forum (only a few days old, just scroll down a page or two in the recent threads list, or use the search function). The software comes with 860 high quality styles, you can listen to some of them both on our website and in files attached to those posts by some of our users. They modded some of them with outstanding results and also unprecedented ease (their words, not ours).