I stil have several Anatek Pocket units..Pocket channel, Pocket split,Pocket merge, Pocket Transpose, Pocket pedal etc..

I recall using these pedals with early arrangers like Roland 301 and 305 arrangers..Using Pocket channel I was able to layer additional sounds from the same keyboard ..using the "open" channels like 14 and 15..

I used the Pocket pedal for EV5 and dp2 pedals that the keyboard did not support..and the merge pedal was a must when you were midi..ing 3 keyboards...Pocket transpose was always needed..for JX10 and other units with no transpose..
Anatek had a brilliant concept...and they worked..