KVR Audio

The Chase · Post by **The Chase** » Sat Mar 18, 2006 8:00 pm

Ok so so got this idea when making pads. WOuld it be possible to make a reverb that takes MIDI input, so it would only reverberate the notes of MIDI it gets in?

For instance ,lets say you would have pads playing at D4 (293.66 Hz), A4 (440 Hz), and D5 (587.33 Hz). The pads would be going into the reverb. When these pads are playing, you have MIDI sending the note C5 (523.25 Hz) into the reverb, so it only reverberates the artifacts from the pads present at 523.25 Hz. Would this be possible? If so, I think it would be awesome.

jupiter8 · Post by **jupiter8** » Sat Mar 18, 2006 8:07 pm

Not really. At least not on the reverb level. However it would be possible to make a synth that has effect sends individually for each note. And one could modulate that with poly aftertouch for example.

The reason it would'nt work on the reverb level is that the A4 has frequences (unless it is a sine) in the C5 range. So you would'nt be able to separate them.

camsr · Post by **camsr** » Sat Mar 18, 2006 8:13 pm

just use a bandpass filter before the reverb.

The Chase · Post by **The Chase** » Sat Mar 18, 2006 8:26 pm

jupiter8 wrote:Not really. At least not on the reverb level. However it would be possible to make a synth that has effect sends individually for each note. And one could modulate that with poly aftertouch for example.

The reason it would'nt work on the reverb level is that the A4 has frequences (unless it is a sine) in the C5 range. So you would'nt be able to separate them.

That's the point though? if A4 didnt have any frequent content in the C5 range then there wouldnt be anything to reverberate.

Really it would only be like an automated parametric eq (or just a BP filter if you just want to send one note to the reverb) on the input of the reverb, right? Say you're sending the C5 to the reverb so it's like a sharp BP filter set to 523.25 Hz, right?

camsr · Post by **camsr** » Sat Mar 18, 2006 8:37 pm

ahh so you want polyphony? As far as I know if you want to do that it needs to be done on a per-voice basis, and that means either multiple channel instances of the synth or the effect built into the synth, acting on each voice seperately.

Kingston · Post by **Kingston** » Sat Mar 18, 2006 8:38 pm

Like was said, a gated bandpass with a possible enveloped follower pre or post the reverb would do it.

It could be made more sophisticated if the bandpass would excite only the selected frequencies withing the delay-allpass network. It could also feature a pre-emhasis and de-emphasis with a (saw? as in rich harmonics) oscillator inbetween. you wouldn't hear the oscillator, just its excited harmonics.

Yes, it's very much possible to do your requested harmoni-reverb thingy.

jupiter8 · Post by **jupiter8** » Sat Mar 18, 2006 8:39 pm

Read the whole the thing again. Seems like i misunderstood it the first time.

Yes, a midi controllabe bandpass would do.

I thought you wanted reverb on the whole sound from, say key C5. I have seen the errors of my way.

Kingston · Post by **Kingston** » Sat Mar 18, 2006 9:04 pm

There's already a midi controllable notch filter. It would be trivial thing to convert that to bandpass and put it on the reverb track. (post or pre reverb)

I remember the author made the notch filter to a request several months back. I can't for the world of it remember its name but I Chris Huelsbeck was the one who requested it.

Le Chase, I'd recommend you do a good search and ask the author.

[EDIT]

tada! here it is http://www.kvraudio.com/forum/viewtopic ... tch+filter

[EDIT2]

It has already been done.

Grab detroyfx rez synth and be done with it.

http://destroyfx.smartelectronix.com/

Hewitt Huntwork · Post by **Hewitt Huntwork** » Sat Mar 18, 2006 9:25 pm

I don't know if this is possible either, but it would be a great idea! And why stop with reverb? Why not create effects that can have their parameters linked to midi notes, so when you play a part the effects are constantly changing? I don't really have the lingo down to convey what I'm talking about, so humor me!

jens · Post by **jens** » Sat Mar 18, 2006 9:32 pm

The Chase wrote:When these pads are playing, you have MIDI sending the note C5 (523.25 Hz) into the reverb, so it only reverberates the artifacts from the pads present at 523.25 Hz. Would this be possible? If so, I think it would be awesome.

the frequency of a note is where the fundamental is but all sounds of course contain a lot of other frequencies apart from the fundamental...

edit: I was wrong - it's not called fundamental - the fundamental is something else (who'd guess that English isn't my native language

)

Kingston · Post by **Kingston** » Sat Mar 18, 2006 9:52 pm

well the point came across nevertheless. In the end bandpass (combined with harmonic combfiltering) would be a crude approximation of what Le Chase is after.

xoxos · Post by **xoxos** » Sat Mar 18, 2006 11:06 pm

looks like another case for multiple instances :p

deaf dunderkwac · Post by **deaf dunderkwac** » Sun Mar 19, 2006 12:05 am

xoxos wrote:looks like another case for multiple instances :p

what xoxos said, I do that effect by running multiple instances of the same synth and tossing the notes I don't want verbed.
Not useful for a live situation tho.
I'm pretty sure there might be other ways to do this, such a frequency dependant gate (the bandpass thing used as the key.) but using the bandpass sound for the reverb wouldn't do.

The Chase · Post by **The Chase** » Sun Mar 19, 2006 3:47 am

xoxos wrote:looks like another case for multiple instances :p

that would be a completely different effect. If I ran multiple instances (one into reverb and one not) i would be reverberating the root notes of a different source (and all the frequencies of that source) rather than the band-passed artifacts of the main source.

darrell.barrell · Post by **darrell.barrell** » Sun Mar 19, 2006 4:39 am

You can use DtBlkFx to separate out a particular note using the harmonic filter - this is a bandpass (or bandstop if you want) at a fundamental plus all of the harmonics. You can set it to boost or remove all harmonics, only even or only odd.

It can actively find the note within a frequency range or you can specify it directly (though not specifically using MIDI like you want, but there might still be a way).

I can give more detail if you're interested.

My Reverb Idea...Could it work?