This synth has a fair number of built-in wavetables. However, I bought this synth thinking it would allow me to use a custom wavetable. And while it does have an option to import wavetables... This doesn't mean it'll import that wav file you recorded of another synth, and let you use that as a wavetable. That's what I figured. I figured wrong.
Instead, it just closes the import window and says nothing, and nothing happens. I tried again and again. Long story short, you have to give it a very specific audio file, and they aren't really feasible to make by hand. You would need help from software that is specifically designed to create wavetables.
Such software does not exist for iPhone, as of the time I'm writing this review. Literally doesn't exist. Some apps exist for iPad, but none for iphone. And since I'm on iphone exclusively, I'm just plain out of luck. There's legit no way for me to create a wavetable that synthmaster one would be willing to import.
In trying to recreate a very specific sound from an organ at church. I haven't been able to recreate it with "synth one" by audiokit, so I came here looking for more powerful synth options. But without custom wavetables, this synth isn't a single smidgen better than the open source synth.
If you are in iphone, and looking for a synth that more powerful than synth one, this honestly isn't it. Unless you get lucky and one of the built in wavetables is the exact sound you happen to need.