im wondering if anyone here has any experiencing processing external eurorack oscillators with the analog four, how the analog four processes stereo and where in the signal chain the audio in goes. The reason i ask here rather then researching online is that ive only heard of its use as a eurorack oscillator processer on one reddit comment and one youtube comment, not in any video or further documentation. (i am not an analog four owner yet, as knowing abt its processing capabilities is something id like to do before i pull the trigger on buying one)
The audio inputs can typically be used either to …
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Mix the whole A4 output along with a stereo source of your choice, the source is mixed at the output stage and can optionally be sent to each of the three digital FX (chorus/delay/reverb) - it does not pass through the voice path
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Substitute a track’s oscillator for an ‘injected’ one from the input - so to do stereo you would inject input L to Track 1 and input R to Track 2 - each voice circuit is Mono, so you need to use 2 tracks to retain stereo through the A4 - there is no oscillator sync as you are injecting audio, but you can apply AM, filtering, and VCA shaping (and FX sends to fx) … If you want to merge stereo through one Track only, you can swap out Osc1 for In-L and Osc2 for In-R, but it won’t be stereo any more - this leaves you three A4 voices
Keep in mind, if you want to sequence from the A4 you may need to use a Track (either FX or CV track) to CV sequence an external oscillator with V/Oct or Hz/V and you can modulate that CV signal too - or you can have a rudimentary Midi control of the external oscillator pitch - either way, you’ll be looking to gate the oscillator on the Track it is heard on - so typically you would use one of the four CV lanes to send pitch to your oscillator and you’d use the A4’s track gating - set up the CV lane to respond to the sequenced/played note info on the Track the voice is injected to and the track in question will be gating as normal. So the gating would ordinarily come from the Track you inject into, but the pitch can be midi or CV controlled. Both have their advantages and you can of course de-couple the pitch from the gate and sequence pitch and envelopes independently. There’s a tonne of flexibility with teh voice architecture
In practice injecting is a powerful creative option - you can also just drone (open the track ‘VCA’ with an infinitely long note and whatever you inject can be processed (even with teh sequencer stopped) through the voice AM, filter, overdrive and send effects and the source audio could be modulated by the four CV lanes with LFOs or directly via an encoder or with whatever if sequenced
It’s a little modular in a box - it has unrivalled flexibility, it’s this flexibility that makes it less of a sweetspot synth voice, but it has superpowers for the experimenters
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Reviving this thread. Anyone have any known examples/tutorials on youtube?