nooo no modular, me lovee virus all in one box, thankee.
A wavetable/vector-synthesis addition would be massively funky, with immense "Z3ta+"-style waveshaping and incorporating importable PCM single-cycle oscillators (along with a touchscreen)!
Failing the touchscreen, a small oscilloscope display would be nice.
Failing that, a Scart/CRT/DVI connector/output 'add-on option' to display screen on an external consumer television/monitor would be cool.
A hybrid of physcial-modelling would be cool too, a l? Korg Z1/OASYS. No need to be realistic (that would be extortionately expensive), but Z1's isn't realistic, but some way-funky timbres can be pulled out of it when using the physical-modelling algorithms as often the standard 'analogue' oscillator waveshapes like saw/sq/sin etc are boring in comparison! Let's get away from that set mould.
Integrated retro 8-bit synthesis/emulation would be ace, too!! - Ie. C64 (SID) synthesis, etc. (lol, couldn't resist
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As would the ability to 'load-in/import' and utilise VST plugins into the synth for use on patches live.
MORE CONTROL PLEASE. Need an XY joystick, and an XY pad (like the Z1/Kaoss) or a ribbon controller at the least. No point in having all that synthesis power if you can't interact with it flexibly from the control panel.
Er, that'll do for now