Sampling isn’t just limited to hardware.

Why not record your virtual instruments and import the waveforms into a sampler. 

I like to sample the oscillator of a synth and put the waveform in a sampler for example: by adding filters and envelopes you can create a new instrument. 

Apart from new filter types and envelope shapes being available, another added bonus may be precision. A sampler tends to have better timing than a synth for when you want snappy percussive sounds.