I own both as modules,
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the FX on the Hydra are very average compared to the virus.
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The Hydra does better at wavetables because you can build your own from the single cycles whereas the Virus has fixed wavetables.
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Personally I think out of all WT synths I’ve had the HS has the least harsh WT sound which is common with WTs.
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The Virus has its own very distinctive filter which I love, the Hydra has a few really nice sounding filter models & you can tell they are high quality models.
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The HS is mono-Timbral vs 16 channel, which is probably the biggest win for the virus.
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HS has a very nice method of editing via the buttons, it’s a stroke of genius really, but I’m very used to the Virus & think it’s a great well designed interface too. HS does win that one though.
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The virus has some interesting Oscillator Modes, although the HS has the Mutators, both equal on that one I think, they are sufficiently different.
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the HS has the step LFOs which are really good, you can use them to sequence pitches & along with saw LFO pulses is an interesting way to build a sequence, you could target the Oscillators individually using 2 LFOS etc…. The equivalent on the TI is the ARP which is a really really good sequencer, however you need Virus Control plug-in to edit the user pattern.
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if I had to choose just one, the TI is the most useful, it’s a Swiss Army knife of synths & I often make use of using a channel as an external FX unit which is the crowning feature for me, the FX section is sublime.