[ceroxylon]

Check out LMMS [0], I just found it yesterday to run VSTs, I normally stay away from them and just needed a minimal VST host for one I couldn't resist, and I was blown away at what it could do for free. Between that and the synth Surge XT [1] (another free and open source project), you can make any sound you would want to, and use either the sequencer on LMMS or an external hardware sequencer (yes, USB MIDI works, even Bluetooth MIDI).

[0] https://lmms.io/ [1] https://surge-synthesizer.github.io/

[sleepingthom]

Thanks for the recommendation. Unfortunately I do mostly prog / metal stuff these days and while the occasional synth sound can be had for free, a lot of my sounds come from either Helix Native / Neural DSP for guitar / Kontakt for drums. I'll take a look at LMMS.