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fix: components.Pot producing wrong result on first value #13463

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merged 1 commit into from
Jul 13, 2024
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fix: components.Pot producing wrong result on first value #13463

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3 changes: 1 addition & 2 deletions res/controllers/midi-components-0.0.js
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Original file line number Diff line number Diff line change
Expand Up @@ -481,8 +481,7 @@
if (this.max === Component.prototype.max) {
this.max = (1 << 14) - 1;
}
value = (value << 7) + (this._firstLSB ? this._firstLSB : 0);
this.input(channel, control, value, status, group);
this.input(channel, control, (value << 7) + (this._firstLSB ? this._firstLSB : 0), status, group);
}
this.MSB = value;
Comment on lines -484 to 486
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A quick word on the fix:
This only occurred when receiving the first value because this branch is only executed when receiving the first value. this.MSB is only supposed to contain the value of the most significant byte, but the branch erroneously set it contain the entire value. That meant if the MSB was received first everything would work out for the first message, however, when the LSB was received afterwards it would take the bogus MSB value set here resulting in huge bogus values. Once the second MSB was received, everything would work out as usual again. The fix now ensures that this.MSB gets the actual MSB value instead of the "pre-scaled" one that we use in the branch.

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LGTM

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