I'm not usually one to suffer from G.A.S. and especially not for hardware, but I'm really captivated by this synth.
Is the "mutator" concept a unique thing here, or do other synths have a similar approach? i.e. the idea of having generic slots that you can use to modify oscillators with different algorithms like FM, PWM, Sync. For example, with four total mutators, it seems like this synth is capable of 4-operator FM algorithms - not sure if all of the conventional 4-op routings are possible, but still seems like a more complete FM implementation than most other synths that claim to have an FM component? (that's a question, i'm not such an expert here)
On the web page, one of the FX mentioned is overdrive, but wasn't demonstrated in the comprehensive video review linked above. Instead, looks like the video showed a "lo-fi" resampler effect instead. It would be very cool to see more proper bitcrushing/overdrive/fuzz/saturation fx on this keyboard.
Sequencer would be awesome if ASM might ever create a Hydra v2 - and even better if it could support multiple simultaneous sequences that can also modulate parameters similar to envelops/LFOs.
Also could be cool to have two pre-FX (with options for series or parallel). Use cases I'm imagining are related to imitating guitar pedal rigs - putting a phaser before an overdrive, or an overdrive into chorus, all of which could be before delay and reverb.