The Toshiba Libretto 50CT originally came with windows 95. It was not meant to be used with MS-DOS; it does not have a hardware volume control. The Libretto uses an OPL3 sound chip that is Sound Blaster compatible (or the other way around, since SB uses OPL3). However not to the point of being able to use Creative Labs drivers or tools. Instead, BCCVOL is a compatible volume mixer:
bccvol ?
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Master volume level = 9 Wave volume level = 9 Synthesizer volume level = 9 CD volume level = 1 Line volume level = 1
Master volume at 9 is way too much. A much more comfortable setting is
bccvol m4
Which can be put in autoexec.bat. It's not a TSR, doesn't consume any memory. Neat!