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Someone correct me if I'm wrong but I'm afraid, the Virus would run out of DSP power quite fast, wouldn't it? That's also why its envelopes have rather slow attack phases compared to e.g. Zebra.

I'm not sure I agree that the envelope attacks are slow... I'd say the opposite, actually, as the variation in the last few points (125-127) have a very large range of variation, of course you expect that something to infinity step, but sometimes you really cant get a long enough attack on the envelopes.

Bear in mind that a lot of what you could do that would be useful with audio range LFOs is already available such as FM, RM (AM) and the modulation on the delay effect - I cant think of anything that wouldn't come out as garbage being modulated at audio frequencies with the LFOs. I'm certain that it's a complexity thing, though, as the mod matrix may not be 'polled' fast enough and you would get terrible aliasing, and increasing the polling rate may compromise the overall performance...

If it's possible (and the existence of the 'FM' knob would suggest that it is), it would be nice and useful for creating interesting sonic textures. I can immediately imagine a situation where a siren type sound slowly sped up to become its own rising metallic texture. Build-up heaven. Unfortunately at the moment FM can either be carried out at LFO frequencies or audio frequencies, but not both from the same modulation source.

Making it available to all modulation destinations would be a natural 'why the hell not?' next step.

FM is internal to the oscillator 'structure' in the software - instead of grabbing osc2 value, grab it times osc1 value - synchronising the mod matrix is a much lower frequency process as there would be a lot more going on buffering variables or using semaphores to ensure there isnt inconsistent update of variables, etc.

In other words, the delay effect, for example, may only have its delay time variable updated at, like, 20Hz or something, so if you try to modulate it with a signal going at, say, 1kHz, you would get epic aliasing. Changing the virus OS to support this would be somewhere between sacrificing a lot of voices and a complete rewrite of the OS.

If that's true then it's a bit of a shame. But I can see the logic in it.

Looking at it the other way round, perhaps an interesting feature to add would be a toggle to allow one of the oscillators to go down to LFO frequencies.

Edited to add: Ooh, looks like you can.

They go pretty low.

Dunno how smooth I can make it with the octave shifts...

I'm tempted to try and make this "LFO becoming FM" patch myself

http://www.youtube.com/watch?v=0rD1gQHzc10

Listen from 1:58 to 2:44.

Although I think there's some cheating going on...