You mean midi track one on your MM?

I’m able to sequence my Volca Sample with my MM.

Global edit - Control Menu - Control Out1 - SequenceR: Int+Out

Global edit -Midi Chanls - Base Channel: 01 and Channel Span:06.
^All other fields set to –

Also, Global edit - Midi Seq - Midiseq Set - midi channel per track is set here.