An article I found on Motifator says the following regarding seamless voice switching in Pattern mode:

“each individual MIXING program is extremely powerful…
capable of housing 16 different sounds on as many as 16 different MIDI channels (of course you can layer multiple
sounds on a single MIDI channel so that you can recall complex layers)… Say you need to play piano and strings
layered in your right hand and a bass in your left… simply place these three sounds on the same MIDI channel and
use the NOTE LIMIT parameters of the MIXING EDIT to accomplish this
PART 6 = Piano (CH.6) ‘Bb2’ and above *Insert Sw = on
PART 7 = new Strings (CH.6) ‘Bb2’ and above *Insert Sw = on
PART 8 = Bass (CH.6) ‘A2’ and below *Insert Sw = on”.

I have selected voices for my own mix but can’t seem to layer them.  When I set two (or more) voices to the same channel only one plays. How do I layer multiple voices?  From the pattern screen I press F3 (TRACK)to access the “OUT CH” options.  This seems to be the correct path but when I set multiple voices to the same channel only one voice sounds.

Thanks - Jazzpno88

Take a look at This Thread.

You set the Receive Channel in MIXING [PART] EDIT.