Hello,
I have built a midi controller using an arduino (running standard firmata) to get signal into my laptop. I now want to use some hacked buttons from a dead keyboard controller to make buttons that will toggle the track activator buttons on/off in Live to change the sounds the controller plays. I have succeeded in getting ctlout messages into Ableton. It allows me to map to the track activator button and works once but then subsequent button pushes do nothing. What I want to achieve ultimately is a toggle - one button push turns it on next button push turns it off...or vise versa depending on initial state of button.
I'm not very clear on cc numbers and how to use and am fairly new to pd so I'm stuck.
I'm using cc#80 a generic on/off but I don't get how to make it reverse its operation on the second push of the button.

Any help is greatly appreciated. I am unclear if this is a n Ableton issue or pd.
Thanks in advance. Trying to get this project finished for an exhibit this saturday.
EG
p.s. I attached a photo of the controller beast I'm building!

http://www.pdpatchrepo.info/hurleur/hammer_synth.jpg

dont know if I got you right.
Here is my idea to what I understood.

http://www.pdpatchrepo.info/hurleur/track-toggle.pd

Dear Gromit, this looks promising. I'll go try it with the set up and let you know. If it works I am forever indebted!!!
Thanks,
EG

so Gromit, this is working in theory i.e. when I bang it manually it does what I want. But when I trigger it with the switch it works the first time then it just flashes it on/off but doesn't stay in the other state. I'm wondering if it is the nature of the switch. They are soft contact switches hacked from a broken midi controller, so initally meant for notes. If I hold it down then it stays in the alternate state but after the initial push it just flashes. I guess maybe I can't use these sadly and have to purchase switches that will latch alternately on or off with every push of the button. Unless you can think of some pd magic code to get around this.

ok, update.

http://www.pdpatchrepo.info/hurleur/track-toggle.pd

Hells to yeah!! It's working. I'd buy you a beer if you were near.
Thanks so much.
EG