If you like the music from demoscene, much of it was written on a tracker sequencer: https://en.wikipedia.org/wiki/Music_tracker. I've been playing with Polyend's hardware tracker recently and I love it.

If you want to try a tracker out yourself Renoise is great (much cheaper) option for PC/Mac/Linux. There are also several free trackers out there with varying levels of practicality (I only know Polyend and Renoise so I can't really suggest which free ones are good).

There's a bit of a learning curve but once you get the hang of the workflow it's tons of fun!