Ive not used with the Linnstrument, but Ive been testing with an Erae Touch … and its been working very nicely 
Ive primarily been using (various) soft synths inside daws, mostly Ableton 11 and Bitwig…
oh, and also VCVRack which is starting to become a favourite of mine.
all working fine.
multiple channels - so I presume you mean can you have multiple MPE tracks.
yes, Ive had multiple MPE tracks, you need to assign them different hardware outputs… as each track uses all 16 channels - e.g. I can have tracks using DIN1-4, USB device/usb host
thats pretty much perfect for hardware !
but when using with a computer , it would be nice to have support for USB ‘ports’, so that you could sequence multiple mpe tracks thru the one USB port.
Ive raised this as a feature request to Squarp… so perhaps for the future.
overall, yes it works nicely for MPE.
currently its mainly about recording/playback, but Im looking forward to Squarp’s plans for per note editing … I think this will make it the first hardware sequencer with ‘proper’ MPE support !