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Splitting a drum machine's L and R channels to two effects in Audiobus
Is there a way to split an app's stereo signal into two effects streams? Kind of like the option audiobus gives you for using just the L input or R input on your audio interface as the input for an audiobus signal chain.
The goal was to be able to cheat and use the panning within the drum machine, to send certain drums to an effect in audiobus, and other drums to have dry, and then combine the signals to make a mono drum machine, but with your favorite effects app on say, the snare.
Ideally there would be a drum machine with different Audiobus outputs or buses for each drum, like Loopy HD has for desperate loops (very cool!), but something like this stereo to split mono scenario would sort of work until something outrageous like that arrives.
Comments
Edited. Wrong answer.
I think Auria could(it has busses and multi out setup) but it looks like it isn't audio bus compatible
Yeah, I tried to get something together with MiMix, but it just doesn't have quite the routing or architecture to make it work. You can only get one aux send per channel, and the aux sends only get one audiobus chain (you can't fan out to multiple chains). Also the pre-fader aux sends are still post pan.
Got it to work with AUM, right out of the gate!
The new Kymattica AUM has a complete set of stereo processing utilities, so it was straight forward to route the drum machine in a way that essentially splits the stereo signal into two mono channel strips, so a special effect can be added to one of the channels, and the pan controls in the drum machine turn into an effects send.
To get it set up, route the drum machine channel output to a bus, rather than the speakers, then add two channels with that bus as the source. The stereo to mono utility gets inserted on each bus return, and you pan over to the right channel, for one return, and left channel, for the other return. After the stereo to mono conversion, which is filtering the left and right channels into their own channel strip, insert the effects you want.
Shame on me, completely forgot about it. Right now I haven't the time to test it but just got an idea to get a third channel out: adding a dead center so you could use M/S balance taking out the sides on a third bus.
EDIT: I did a couple of tests. While it could work theoretically, I found pretty hard to find drum apps able to full pan their parts( tried out with iElectribe and DM1). And center sounds have to be entirely mono.
Interesting idea! I tried to get it to work, but the best I could do is cancel the center, I couldn't figure out how to engineer canceling the sides and leaving the center.
Couldn't you actually run 8 stereo channels? ... (8 busses available in AUM). I can't figure out why the panning and m/s stuff is needed now that we have AUM. unless you want to be able to control it all within the drum machine?
once you managed to cancel center, on another bus you place a phase inverted plain signal so you cancel the sides
Because most of the multitimbral apps still have just a coupled stereo out. Doing this you can somehow manage 3 mono tracks out of the said stereo out for further editing for example:
I have this session going on on SeekBeats which has one send/return not-so-usable-chorus, a per part overdrive with amount+on off switch, a bus compressor and expander, and a master distortion unit with a bitcrusher, soft clip/gain, Linear/square/cubic distortion mixer and a delay. Actually I find all of these fx almost of no use at mixing stage.
I've managed to fix a couple of things splitting frequencies but nothing that really makes my drums shine in the mix.
Having the chance to have on separate channels the two kick drums, on another one the HH and the snare, and on a third the bleeps and pops and whatsoever will open up a new scenario for some more creative mixing and effecting.
Got it, makes sense now
Well. Did some further testing for the "three separate channels out of two" and I came with two conclusions and a feature request:
Conclusion 1: as long as the m/s balance is not only killing what plays the mid But also makes the LR channels join in one mono-side signal(a mono signal with L & R having 180 degrees phase like is done when encoding/decoding a m/s matrix) doing this trick will be significantly harder to achieve. And here comes the feature request @j_liljedahl : will be such a nonsense to ask to have the m/s balance to keep left/right info when canceling the mid? Are l/r and m/s paradigms so incompatible?
Conclusion 2: right now I'm not able to discern if all of this is possible rather not; and if it is possible I ain't really able to do the logics to phase out this here and that there.
I don't think that's mathematically possible, actually.
M = L+R
S = L-R
So, playing only S means we subtract R from L, so that a mono component (the part that is equal in both left and right) in the signal cancels itself out. But it also combines the side component (the part that is unequal in left and right) into a single S channel. There's no stereo information left then, so we can't reconstruct L and R from a single S.
For the same reason, we can't remove the side signal and leave only the mid.
Don't the Channel 1 & 2 ind the side Channel retain the original phase?[kickdrum: from the drum machine panned to the left, L phase +, R phase none; snare: from the drum machine panned to the right, L phase none, R phase +| once joined in to a side channel compared to original signal: KD: +L, -R; SD: -L, +R]