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Trigger iOS sampler by drumming/tapping/whatever my acoustic guitar?
Hey guys
It's me again. Still working on my cool Mozaic script that will enable me to become a one person band (using Group the Loop). 
Making good progress, and now I'm wondering how to add drums to my songs. One way is to drum/tap/hit/whatever my acoustic guitar, and simply use the audio that's produced this way.
For example, I can hit the body of the guitar using my flat palm, which produces a kind of a kick drum. Then I can tap the body with a finger nail which produces kind of a block sound. Or I can hit the strings, producing kind of a snare sound.
As the produced audio is quite "mumbly" it would be nice though to enhance those sounds a bit. The cooles thing I can think of would be a sampler that can "listen" to some audio, detect a certain sound and trigger a pre-recorded instrument.
For example, when hitting the body of my guitar with my flat palm, the sampler's kick drum would play. This would trick the audio into believing that the guitar's body really creates the sound (one could even layer both sounds, so it would sound more "believable").
Tricky thing here for the sampler (I suppose) is to detect the sound and play the right audio, as hitting the guitar would not produce the perfectly identical sound each time. I'm not sure whether my idea is possible, but it would be a cool thing, wouldn't it?
Any other idea of creating drums using an acoustic guitar? I know that I could simply trigger a sampler using a MIDI keyboard or pedal, but I'd love to "trick" the audience into believing the guitar actually creates the used sounds, so hitting and slapping on my guitar is a "must" here.
(Beat boxing is another thing to look into one day, that's for sure.)
Thanks for your suggestions and ideas, guys! 
Comments
Guitar audio split into multiple channels of AUM. Filter each channel separately to isolate one type of hit. Give each channel its own Envolver to drive your samples.
I've done such experiments in Drambo already, using peaking EQ filters, envelope followers and logical processors to combine sound features in a more advanced way. It takes time to build that and also to find trigger sounds on your guitar that can be told from each other reliably, but it's a fun field 😊
Unless you want to add some hardware, like Fishman TriplePlay, I suggest:
mic => MIDI Guitar app => MIDI filter => Synths
Where MIDI filter is one of MIDI Fire, Mozaic, etc
It'd be fun to have a set of pads stuck onto the guitar, each triggering a different midi note over Bluetooth MIDI. I'm actually making a small (65mm x 65mm x 20mm) button controller that will do this. It's working already on a breadboard and is just waiting for Santa to deliver a 3D printer. I've been good Santa, honest!
But this isn't what you'd ideally want since it works with buttons, not pads. It's more suitable for launching clips or controlling loopers than as an instrument. I'm interested in finding some way to do this with pressure sensitive conductive material, but that's for somewhere down the road.
I think you will maximize expressivity by going with an Impaktor sort of thing (do-able in Drambo) where rather than triggering sampleS, the tapping is used as the impulse to create the sound. You will capture the nuance and rhythm much better than if you use an envelope follower and trigger samples.
Check it some impaktor demos to see what I mean. Then consider implementing a solution in drambo that uses eq’s to isolate your various taps with each type getting different treatment.
Thanks guys for your suggestions!
What do you mean with "split into multiple channels" and then "filter to isolate"? Other than that, I can see how Envolver would detect an audio signal and would send a MIDI message to e.g. a sampler.
Can you give some more information about this? It sounds promising.
I do have a Fishman TriplePlay Connect, although I couldn't install it yet as my guitar's bridge is too low.
But I will fix that some day soon.
I also got Mozaic. But I'm unsure how it would be possible to detect a certain sound from the generated MIDI, as I expect it to be pretty "mumbly"/chaotic when being generated through hitting the guitar in certain ways. (While I could trigger a sampler by playing specific notes/strings and the MIDI that is generated through it, it doesn't feel very natural to "play" a drum set on strings. The audience wouldn't like it, I guess.)
Cool idea! But I would love to "trick" the audience into believing that the generated sound comes truly out of the guitar's body, so an additional controller on top of the guitar wouldn't work this way I guess.
Thanks so far, guys! Happy to hear more details.
Let's do an experiment. Record all kinds of different "percussion" hits on your guitar (not necessarily strings, much more different body positions, fret hits, with different soft and hard hits with as much sound variety as possible. Send me the file and I will try to build something that recognizes them and trigger real drum and percussion sounds. I cannot promise anything but I like the idea!
As a fretboard midi guy and you rocker I was just thinking envolver fac. Your ideas are cool im a lil confused but if your like Keller Williams style and looping you will want to filter out maybe the low notes, or the 'natural resonance notes' of the acoustic.... The end game goal in a nutshell is making beats from the acoustic but not natural wood tones... someone here will steer you proper.
Great offer! I will try to figure out some sounds and send them to you soon. Thanks!
Cool! 👍🏼
@josh83 why do you care what the audience perceives regarding how you get the signal into your iOS device? If you get a good groove going I doubt many care how you made the sausage? (Fair point if YOU do though.)
I've gone down the path you are headed down and you'll likely get it to work with the help of wizards like @rs2000 . I ended up buying an ACPAD, which saved me a ton of time and frustration as it gave me eight pads for knocking out drums and bass lines and chords on the fly. The audience can see that I'm "playing" the controller on my guitar just like I'd play a keyboard or grid controller.
Lately I've set up a Genki Wave to respond to zones I set up on the face of my acoustic that correspond to different samples when i tap with the ring on. Talk about magic!
Anyway, my point is that there are many ways to find your way of doing it but in the long run you'll have more success and fun if you find the mode of expression that feels best to you.
To be fair, @lukesleepwalker @josh83’s idea seems like a cool one from an audience standpoint, bringing some extra unexpected magic to a live one-person performance. But yeah, that could be more for their benefit than the artist’s, though maybe something like that that adds to the performative aspect perhaps nets more money in the hat for a live busker, for example
Oh, for sure! I've set up my acoustic to do pretty much as he describes (using the mic mounted under the acoustic top) and it was fun/magical. My problem is that it wasn't consistent and predictable enough in a live environment--maybe not a problem for @josh83 (especially with Drambo's excellent toolset). I was reacting to this: "so hitting and slapping on my guitar is a "must" here". Maybe I misread it, but I interpreted that to mean that the audience reacts to the physicality of the experience. That's not my experience and I found it important after trying many different avenues to privilege my confidence in the solution and how much expression I could squeeze out of the tools that I use.
This is what I thought of when I opened the thread. FAC Envolver can convert audio hits/pulses to midi notes, send to whatever recording sequencer and rearrange as needed to send to a drum app.
How would you make Envolver detect different hit sounds to trigger different drum or percussion hits?
I think to have a whole drum kit, it would take an intermediate step to record into a sequencer and then rearrange the hits to trigger whatever drum sounds to one’s liking. Not awful, but not as direct as one might like.
Just tested this out snapping my fingers into the crappy iPad microphone. You can map the snaps as either a note or a scale in FAC Envolver and record in Atom. Useful, I think.
That's the simplest solution supporting only one trigger but we're about to try and go beyond that 😉
Understood!
I just realised: when I can trigger MIDI by hitting my guitar's body, I might also be able to do beatboxing with my mouth to have a similar effect! As my mouth and voice are capable of creating even more sophisticated/characteristic sounds, this would work even better I guess.
Maybe (to increase expression) the MIDI would even react to the volume of the sounds? So I could trigger a snare with a loud voice to make it loud, and with a soft voice to make it soft...? This would be a cool concept for a funny beatboxing app which lets you record some sounds and then map these to a virtual drum set (or whatever instrument).
I will record some sounds soon and send them to you, @rs2000! It would be so awesome to get this to work.
I love how people in this forum are inspired by questions and brainstorm about them.
Yes, all that is worth a try. Mapping volume to MIDI velocity is easy, the difficult part is the separation of sounds so that one does not trigger the other. I'm looking forward to your recordings!