Greetings,

I'm a little new with PD, so I could use some pointers on a simple patch I am writing. The patch is to be used to convert midi messages coming out of a 'Rockband Pro' guitar. This toy guitar has buttons for every fret, and strings to trigger note on for each of those buttons.

I am posting my current patch here, which translates the first five notes on the low E string. Note data is received from the guitar on 6 different channels (channel 6 is low E).

The patch checks to see the note number, and then to see if velocity is higher than 0 (note on). If a message comes in from channel 6, note 16, above velocity 0, then it sends a note message for E1. Detecting channel is important, of course, because the same note can appear more than once across the fretboard.

Right now, when using this patch, I am finding some significant latency compared to just using midi out from the guitar directly. Any help would be greatly appreciated!

p.

http://www.pdpatchrepo.info/hurleur/rockbandguitar.pd

your patch looks a bit inconvenient.
And what's your aim?
Just passing incomming notes?

http://www.pdpatchrepo.info/hurleur/rockbandguitar.pd

btw: the "delay" value in in the audio settings affects audio AND MIDI lantency

@Gromit said:

your patch looks a bit inconvenient.

Surely! Can you offer me any ideas as to how to write this patch more clear and accurately? Some example code here would really help me out.

@Gromit said:

And what's your aim?
Just passing incomming notes?

Essentially, yes, just looking to pass along incoming notes. But also I want to be able to route them as I please. For instance, strings 6,5,4 get re-routed to control one external instrument, while strings 3,2,1 control a different external instrument. Or any other combination.

Also, there are a number of buttons on the controller which send midi data. There is also an accelerometer on the guitar, which sends a sysex value when headstock is pointed down, and another sysex value when headstock is pointed up. So it would be easy to write some code that allows me to move the neck up and down to control the rate of an LFO which controls pitch frequency.

Anyways, right now I'm just trying to get the basic midi routing code to work with as little latency as possible.

Thanks!

p.

@Gromit said:

btw: the "delay" value in in the audio settings affects audio AND MIDI lantency

Ahh yes. I was curious about this. I've been finding that adjusting this value results in serious performance problems...

@petervh said:

@Gromit said:

your patch looks a bit inconvenient.

Surely! Can you offer me any ideas as to how to write this patch more clear and accurately? Some example code here would really help me out.

look at the attached patch

@Gromit said:

@petervh said:

@Gromit said:

your patch looks a bit inconvenient.

Surely! Can you offer me any ideas as to how to write this patch more clear and accurately? Some example code here would really help me out.

look at the attached patch

Aha! Interesting, thanks!! .I'm going to dig through this.

When I finish the patch, I'll post it back in this thread for anybody else who happens to have one of these toys.