I do not know this module well, but I would imagine that there is an awful lot to explore and I recommend that you do this for at least a month or two first, definitely load your own waveforms, see what you want that it can't do and then start to look for your second VCO that fills the gap.
If you can't wait, then I would recommend something analogue and juicy, any of them will be great, and there are some fantastic second hand bargains in the Marketplace at the moment!