Scope synths with at least one audio input to modulate something. Or synths made for it with more inputs for audio modulation.
There are two good ones that come it it. and hopefully more in the future . I will try to do a Scope modular too, because it works fine with it.
It can trigger drum boxes too, but I wonder if that's interesting: i mean, we can trigger drums with midi, so is it interesting to trigger them inside scope? "dawless"is possible but I am not sure it is desirable (because it takes additional dsp resources just to say "i'm dawles", which can be cool, but a bit irrational , i suppose
KrOn can control hardware synths in the V/oct (eurorack and 99% of analog synths) and also Korg Hz/V format.
No problem for the Dark Energy; it is V/oct format so you can use with KrON - BUT you need a Epert Sleeper ES3 (adat to CV) (+ small eurorack case for the power supply) to make the link between Scope and ahardware synth/eurorack module.
If you can do it, I think it is worth it because it adds many possibilities for composing and sound design.
I need to try through the CV/Expression pedal input of any keyboard; in general, it's a CV input , then converted into a Midi CC number. I haven't tried yet though + i don't see the interest in converting CV into midi (because we can draw the Midi directly in the daw, and at the end, the converted CV signal fed into an expression pedal input would loose its CV character and becomes a midi control... but i think it can be done if desired).
For VSTi, it depends: first, because the vsti standard forbids audio inputs as modulators. I haven't seen synths with sidechain input, but that would work. I berleive you can control a sidechain signal witrh KrOn, if the asio latency is not a problem.
But, when used standalone, a soft MOdular Synth that is calibrated on V/OCT: you just need to boost the KrON signal by +12dB and you are done (and this boost of +12dB is available in Kron, so no need for external modules). I tried with "Voltage" from "Cherry Audio" and it works fine (the Cherry Audio Voltage is in beta, so not perfect, let's wait for their public release to know exactly if it keeps its promisses). .
I never worked with CV modulation neither until recently ... it is a "why did I wait so long" case...
It is different from Midi, and gives you results that are superior in terms of authenticity of the result, in my opinion ( if you think 70's and 80's. The same synth sound much more "analogic" than with midi, because that's the sounds we have heard in old records, but that do not have the same flavor when done with midi instead of CV.
The best is to use both CV and midi anyway and krOn tries to build on this "collaboration" and does not seek to "do it all" nor to replace midi.
I think will be released in september.