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This is fantastic guys, thanks! I'm now significantly more knowledgeable, which is always great!

It looks like my best starting point is a basic tremolo, probably one based on the TAPLFO ic.
Also it seems like my highest hurdle is also the one I really wanted, a stereo phase control.

Using a pair of TAPLFO ics, I could potentially run one as the 'master', and feed the 'clock out' signal into the tap cv input on the 'slave'. But then is there some way I could delay the 'clock out' pulses by a variable amount, in order to have control over the relative phase?

The other option is probably easier and slightly less 'hacked together', which is to code my own micro-controller with the ability to adjust output phases. its just more time consuming!

my options are limited as it seems there's no way to do tap control without a micro-controller. Has anyone ever designed an op amp oscillator with tap control?

As far as the dry signal path is concerned, my current understanding is that at least two op-amps are needed for a basic mono tremolo. One to buffer the input (probably unity gain), provide tone shaping if desired, going into an ldr/led/vactrol section, and a second to buffer the output, provide a level control, and again adjust tone if desired.
Does that seem like an accurate assessment?

Hey!
So after falling in love with the sound of stereo tremolo, particularly with variable phases between 'left' and 'right' (like the flux effects liquid tremolo or the 'rt. phase' control on the EHX super pulsar), I've got the idea stuck in my head to design one myself, to my own requirements. Only problem is, I actually don't know how the basic tremolo circuit operates!

If you could share some of your valuable knowledge here, I'd very much appreciate it! I'm keen to learn about LFO design and operation, how to use it to create the tremolo effect, how to add tap capabilities, how to trem two signals with out of phase LFOs while maintaining control over the phase shift, and anthing else you may think is important!

to give some context, the feature set I'd ideally put in is:
*Stereo or mono operation
*Stereo phase control
*tap tempo
*At least square and triangle waveforms
*All the usual suspects (rate, depth, volume, shape skewing)

I'm currently studying electrical engineering (fourth year), so i understand most things about resistors, capacitors, inductors, basic op amp circuits, etc.
I'm happy to spend time reading articles or explanations if there are some particularly useful ones. I'm planning on lots of research before even starting schematic design!

I'm keen to learn, so please be keen to share!

Stuart