Thanks for your interest @mex!
MatriX will work nicely with any SEQ v4 - Wilba panel or handmade - as long as it runs a somewhat recent firmware and as long as you have a MIDI IN/OUT pair available to create a BLM port 🙂.
Drums mode is fantastic, but it is very nice also in 303 mode. In this video i’m using the MatriX with four tracks/four different synths in conjunction with my SEQ v4+, but it would work identically on your SEQ v4:
We still have a limited number of MatriCes available in the first batch, including free shipping - when they are sold out i fear the next restock could take a while due to the global component shortage.
Best regards and enjoy!