[Ardour-Users] MIDI "Rolling mallets"

Ralf Mardorf ralf.mardorf at alice-dsl.net
Sat Jan 18 23:47:31 PST 2020

On Sun, 19 Jan 2020 04:29:02 +0000 (UTC), Chuck Raudonis wrote:
> Hi,
>I want to simulate the sound of playing a steel drum where the note
>being held is rolled over and over either with itself or the same note
>an octave up.  The MIDI track will have two notes held as a chord for
>the note duration and the filter/plugin will take those two notes and
>roll them at a speed of maybe 1/32 of a beat alternating between the
>two of them.  1212121212 which simulates the player rolling his two
>mallets on the two notes. I've looked all around for something to do
>this and haven't found anything.  I want the input to be the recorded
>MIDI and the output is the modified MIDI that goes out to the
>instrument loaded on that track. Anyone have any ideas? Thanks!  


for similar purposes I tend to record something like this by one MIDI
track in the first place and after that to copy the MIDI track to one or
more additional MIDI tracks. Then I delete notes by one or the other
MIDI track, IOW the sum of all MIDI tracks has got no duplicated MIDI
note anymore.

So for your plan, I would keep the note being held, that isn't
manipulated by a filter, on one track and the other two notes on another
MIDI track, with another MIDI channel, using the same sound by a second
instance of the same synth.

Regarding the filter plugin it depends on what is available.
Either use a "normal" filter and control it by automation or use a
filter plugin with a step sequencer.

Not on my Linux machine, but on my iPad Pro I successfully used
https://apps.apple.com/app/perforator/id1382134258#?platform=ipad ,
unfortunately it only allows to control the volume, not a filter. Yes,
it has got a filter control, but it doesn't allow real filter effects,
it more or less just allows to fine tune the volume effect.

IIUC this Linux plugin does the same or something similar, too:

Maybe you are able to find this kind of plugin for manipulating the
audio stream with a filter. If not, consider to use automation.


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