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Implement the ENVELOPE command for enhancing SOUNDΒ #48

@leventp

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@leventp

BBC Basic provides the ENVELOPE command to compliment SOUND. Looks like there is a pull request in VDP to provide enhanced sound functionality, so perhaps it can be utilized for this request. Not sure the same syntax as BBC one can be provided, but it would make it easier to define the parameters compared to the long-winded VDU statements described in the pull request.
Note up to 4 ENVELOPEs can be defined in BBC BASIC.
As a site note on SOUND:
BBC Basic uses channel 0 for noise and 1-3 for tunes where as Agon BASIC uses channels 0-2 for tunes.
The volume parameter can be used for ENVELOPE numbers (1-4)

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