Alda does MIDI out, so you could probably route Alda to PD (PD is really good at handling MIDI signals).<p>While not graphical like PD, several musical languages make a distinction between the sound design (signal flow and modules) and events (notes, etc).<p>Csound is the first to come to mind, with it&#x27;s MUSIC N orchestra + score paradigm. The orchestra syntax (especially the new changes in csound6) lends itself nicely to expressive sound design. Scores, however, are tedious to write by hand. Most Csounders opt to generate these using another program (which in itself is pretty cool, IMO)<p>ChucK does a similar thing as well, where you can write the signal chain (oscillator =&gt; filter =&gt; dac) and then you can control it using ChucK&#x27;s C-like syntax. If you are interested in algorithmic composition and have a stronger background in programming, this is a pretty fun language to work in. That being said, Csound has a much better collection of sound modules.<p>Not exactly the answer you were looking for, but I hope you can check them both out, as they offer different approaches to computer music composition.