/usr/share/SuperCollider/SCClassLibrary/Common/Audio/ is in supercollider-common 1:3.4.5-1wheezy1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/AudioIn.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/BEQSuite.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/BasicOpsUGen.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/BufIO.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Chaos.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/CheckBadValues.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Compander.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/DelayWr.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Delays.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Demand.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/DiskIO.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Env.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/EnvGen.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/FFT.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/FFT2.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/FFTUnpacking.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/FSinOsc.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Filter.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/FreeVerb.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/GVerb.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Gendyn.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/GrainUGens.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Hilbert.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/IEnvGen.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/InOut.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/InfoUGens.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/InterplEnv.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Line.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/MacUGens.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/MachineListening.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Mix.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/MoogFF.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Noise.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Osc.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/PSinGrain.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Pan.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/PartConv.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/PhysicalModel.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/PitchShift.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Pluck.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Poll.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Splay.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/SynthDef.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/SynthDesc.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/SystemSynthDefs.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/Trig.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/UGen.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/UGenCategories.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Audio/canFreeSynth.sc