A digital bass box with sounds better than some analogue keyboards. It runs on the same principles as the Spectrum Synth, but this box is strictly basses. Sampled waveforms with digital filters do a great job of coming as close as possible to actual analogue...
Consider the Spectrum Synth either a poor man's Nord Lead or a digital Oberheim Matrix. It's an affordable simulation of an analogue synthezizer module that uses Sampled waveforms and digital envelopes and filters to create close approximations of analogue sounds.
if you want a rock solid keybaord that has great sounds, buy a unit like this. Although, the acoustical instruments are sometimes lacking (Such as the piano) this unit has a TON of positives. Its sounds are crisp and warm.
The dpm offers 3 independent envelopes and a low pass filter for each patch you create. The combo idea allows you to combine up to 4 patches in one. each one could have its own midi channel if necessary.