Both Argon and HS allow external control for sequencing, so at that they’re equal.
The Mod-Matrix on the Hydrasynth, with the sources of Midi CCs (and lots more) and all the destinations is stronger than the Argon.
Big for the Argon is the 512 step sequencer built in PLUS it has the 4 parameter animation rows. This is a lot of power, and you can do some amazing things with those animation rows! I like that you can create animations blindly and then later apply them to a sequence. Someone that uses the Argon, can describe this better than i.
The HS goes at this all in a different way. It has no sequencer built-in. It does have the two CV input channels (mapable in the Mod-Matrix). It also has 5 LFOs and 5 Envelopes, each of which can be made to act like the other, so that’s ten modulation sources. But more in specific with the arpeggiator, it does “additive arpeggiation”. This permits you to put in a “sequence” of notes, into the arpeggiator, up to 32, which is different than chord arpeggiation. Using the pads you put a series into the arpeggiator, that can have repeated notes. Now this isn’t a sequencer, so there aren’t different note lengths, or rests, etc, nor is it editable, but it does have melodic flow.
The HS also has many, many parameters for the arpeggiator that you can control and modulate, which allows you to “play” the arpeggiator. I’d be happy to tell you about all this, but there’s a lot to it, so it would be a separate post, but a for instance is the Mode, Chance, Ratchet, and Length parameters that let you change up an arpeggiated sequence.
You also have the ability to set a key and scale for the voice, which takes the raw arpeggiated data, and fits that to the harmony you have set with key and scale. Unfortunately key and scale can only be set using front panel controls – i want them to be destinations for the Mod-Matrix.
One thing to point out, something that gets missed – the HSK is different from the HSD, in that the HSK also has a Chord function, chords being different than the ones used by the arpeggiator.
With my HSK, i just run an external sequencer, or use the tricks i’ve outlined above, or a combination of the two.
Good though for you to key in on this difference.