Korg seem to be re-focussing on their Volca range at the moment, with the availability of the new Volca Mix which not only powers up to three Volcas, but also has four mix channels - two mono and one stereo, master clock/tempo and built in dynamics process on the mix bus., plus an Aux send and return.
In this rather lovely piece by RemixSample on Youtube, the Volca FM, the 3 voice DX type , 6 operator FM synth which also loads DX-7 patches, is run through the equally lovely Valhalla Shimmer plug-in for some luscious freestyle jamming.
We reviewed the Korg Volca FM when it came out, and also checked out the RetroKits RK002 Midi cable firmware which allows velocity mapping