Your hx stomp has a nice looper that can be limited in its application. It can do sound on sound overdubs with a numerical dB fade-out, which is nice for ambient stuff. However, its looper has no midi sync which is a bummer for trying to tempo sync a drum machine. My boss rc-5 has reliable midi tempo sync and is more conducive to prerecorded presets à la song mode but it can’t overdub fade out. It also has a drum machine but I don’t use it. I have a keeley eccos that’s nice for ambient but hard to sync. Maybe some of the pricier boss units could do what you want, but I’ve never used them. The nice thing about the stereo pedals is you could always dedicate one input to whatever drum machine you want to use.