Simple way of layering Playback Processors?

[gnoejuan]

I was hoping there was a straightforward way of playing files on top of each other. And even after putting the playback processors into a plugin processor, the only sound being rendered is the first argument.

What I had imagined:

bass = engine.make_playback_processor("bass", load_audio_file("Projects/_/_/inputs/SL_LC_Synth_Bass_85_G_03.wav"))
synth = engine.make_playback_processor("synth", load_audio_file("Projects/_/_/inputs/SL_LC_Synth_Melody_90_G_17.wav"))
tempo = engine.make_playback_processor("drums", load_audio_file("Projects/_/_/inputs/SL_LoFi_Drum_Tops_80_01.wav"))

bass.record = True
synth.record = True
tempo.record = True

graph = [
  (bass, []), # Playback has no inputs.
  (synth, []), # Playback has no inputs.
  (tempo, []),  # Playback has no inputs
]

engine.load_graph(graph)
engine.render(30)
audio = engine.get_audio()
wavfile.write('Projects/__/__/outputs/samples.wav', SAMPLE_RATE, audio.transpose())
show_audio(audio)

and using a plugin only renders the first argument in the []

graph = [
  (bass, []), # Playback has no inputs.
  (synth, []), # Playback has no inputs.
  (tempo, []),  # Playback has no inputs
  (reverb_processor, ["synth", "drums", "bass"]) 
]

In this example, only synth is rendered.

In this setup, like the documentation says, the audio that's played and written to the wavfile is the last one.

[DBraun]

I think in this case you want to use the Add Processor. You also don't need to set .record to True, unless you care about the intermediate signals. So I think this snippet will help.

add_processor = engine.make_add_processor("added", [1., 1., 1.])
# you can optionally do the following line whenever you want
add_processor.gain_levels = [1., 1., 1.]
graph = [
  (bass, []), # Playback has no inputs.
  (synth, []), # Playback has no inputs.
  (tempo, []),  # Playback has no inputs
  (add_processor, ["synth", "drums", "bass"]),
  (reverb_processor, ["added"])
]

[gnoejuan]

That worked! Thank you!