Eliot Miranda uploaded a new version of Sound to project The Trunk: http://source.squeak.org/trunk/Sound-eem.72.mcz
==================== Summary ====================
Name: Sound-eem.72 Author: eem Time: 19 September 2020, 6:41:04.690078 am UUID: 993decea-486a-4d07-badb-dda290a3194e Ancestors: Sound-ct.71
Fix an annopying behaviour in MixedSound. If the same SampledSound is added more than once to a MixedSound then mix-down will produce weird results. Fix by checking for duplicates in MixedSound>>add:pan:volume: and silently taking a copy. Levente, if this is the wrong approach LMK and I can commit a version that raises an error instead.
=============== Diff against Sound-ct.71 ===============
Item was changed: ----- Method: MixedSound>>add:pan:volume: (in category 'composition') ----- add: aSound pan: leftRightPan volume: volume "Add the given sound with the given left-right pan, where 0.0 is full left, 1.0 is full right, and 0.5 is centered. The loudness of the sound will be scaled by volume, which ranges from 0 to 1.0."
| pan vol | pan := ((leftRightPan * ScaleFactor) asInteger max: 0) min: ScaleFactor. vol := ((volume * ScaleFactor) asInteger max: 0) min: ScaleFactor. + "Sounds have state. If a sound occurs more than once in sounds then mixing can produce some very strange results" + sounds := sounds copyWith: ((sounds includes: aSound) ifTrue: [aSound copy] ifFalse: [aSound]). - sounds := sounds copyWith: aSound. leftVols := leftVols copyWith: ((ScaleFactor - pan) * vol) // ScaleFactor. + rightVols := rightVols copyWith: (pan * vol) // ScaleFactor! - rightVols := rightVols copyWith: (pan * vol) // ScaleFactor. - !