Volume of envelope - Change the volume of the envelope.

 vOlUme Of envelOPe
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CHANGING THE VOLUME OF THE ENVELOPE. works
on scOrPiOn aY bac. doesn't work on Zx
           128 Ym abc and all emulators.
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in this regard, I would like to test
   create this effect on your computer.
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listen to this music. change the volume
The envelope is used twice:
                  at the beginning and in the middle.
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