Source Audio (with Bob Chidlaw) have in a few instances broken ground with their one-series pedals. The EQ2, Atlas, and Ventris pedals sort of blew the doors wide open for what can be gotten with EQ, compression, and reverb in smaller format pedals.
I have a C4, which is successful as a synth pedal that "celebrates" (?) a VERY digital sound (to my ear). It does have a pretty nice feature set for pitch shifting, but sonically, it wasn't very successful or ground-breaking, to my ear.
I don't agree with your blanket statement that the C4 sounds "Very Digital". It really depends on what part of the C4 you are referring to. The Analog down octaver sounds just like a Boss OC-2 to my ears...which is only matched by the Boss OC-5 in terms of a digital re-creation of this complex analogue sound. All other digital octavers sound like the EHX Hog / Pog / Eventide H9-90 or even C4 in poly octave mode.
The filters (the Intelligent Spectrum parts) sound just as analogue as the devices they are emulating / simulating. In fact I can pretty much nail a Xerograph or even a Moog MF 101 which are both definitions of an analogue filter sound.
The subtractive synth part, this sounds to my ears a lot like an old 80's analogue synth. I can re-create almost any Roland Juno sound from it. It's THAT good. However, those sound have a certain metallic edge to them because they are electronic Subtractive synths. The FM part...sounds a lot like a simple 80's (analogue) FM synth.
The harmoniser section sounds just like my H9 and EHX Hog 2. That's because of how the maths work. The C4 Harmoniser's achillies heel (in my opinion) is it's lack of control of the pitch, intervals, key and modes of the harmoniser outside of the App. To get to them you need a phone or plug into a laptop via USB. I've made extrensive trials in trying to map these controls to expernal midi devices / knobs and it's not ended well.
The features are there, but the midi mapping and control isn't very good. That said...we are exploring the very furthest reaches of both the C4's capability and the hardware's capability of providing knob assignments.
I'm a big fan of the C4, thre literally isn't anything like it on the market. But I also have a EHX Hog2 and a pair of H9's (Soon to be a H90 instead), all of which perform different functions or roles.
The Hog 2 does stuff that the other pedals just can't do so well (or allow real time control over) and the H9/H90's have their own things going on which the other 2 pedals can sort of mimic but not as well or as well controlable.
One of the remarkable things about the C4 is that it truely is tiny for what it does. It is half the size of a H9 and about 1/6th of the size of a Hog 2. It's about 1/3rd of the size of a H90. The fact that it's so small and easy to power is one of it's likeable features. However, the small foot print 4 knob format is always going to be one of it's live use limitations. Where as the Hog2 which has a slider for every function is a massive panel. Can you imagine what a C4 would look like if it had a physical control for every function? It would look like a modular synth...the size of a wall.