The big "work-a-round" is copy/paste. It works, but is often awkward. Some synths don't have a metronome (I use a metronome app running in the background)and even with one it is hard to "feel the grove" of your song if you can't hear it. Well, I made an interesting discovery.
I was messing around with Additive Synth (LOVE IT), and got a wild hair.... I opened Beatmaker 2, and looped a song. Hit the button to switch to Additive Synth and noted BM2 kept playing. I started playing Additive Synth and was still hearing BM2! I could actually play along in real time with BM2! I had tried this in the past with Sunriser, but it didn't work. So then I opened up iSyn Poly (another Virsyn synth) and it worked too! I tried Nanostudio and FL Studio but they did not work. But in BM2 I can play these synths along with my song in BM2 and record. Then copy/paste a better "take" into BM2... I am very pleased
So what is going on? What are BM2 and Virsyn doing that makes this possible, but not possible with other sequencers and synths?