Is it possible to control volume, speed and effects in real time, when a file is played with audacity?
I’m designing human interfaces with Arduino for deaf childs and old people with problems on the hands.
I can identify movements and fingers positions, and then send a value, but I can not see how I can modify those parameters (speed, volume, etc in Audacity in real time
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I could use a keys combination too.
Speed: Yes, but with the limitation that playback needs to stop to change the speed setting
Use the “Transcription toolbar” speed control: http://manual.audacityteam.org/man/transcription_toolbar.html
Note that this affects both tempo and pitch - it literally changes the playback speed.
If you are using Windows for running the audio playback, you may be better to use a lightweight VST host rather than Audacity, and control effects through MIDI Control messages.