The Phasor is a great sound card. Offers you 12 sound channels (using 
all sorts of wave-form patterns and effects, simular to FM-synthesis in IBMs),
4 white noise generators (synthesized drums, etc) and a 1-voice synthesized
speech channel, expandable to 2 speech channels. Has a 4 watt amplifier that
can drive stereo speakers (left & right). It's compatible with most older
sound cards, like the Mockingboard, ALF, SMS and Echo+. Few programs ever
supported it, let alone many programs out there that supported the older cards.
It did, however, come with some decent software that showed off the card's
features and let you experiment with it a bit. 

	The four DIP switches control emulation modes and standard Apple ][
internal speaker sound-level (only if you disconnect internal speaker and have
old speaker toggling sent to Phasor). Switches #1 and #2 are for emulations.
Switches #3 and #4 control your old internal speaker sounds, again, *if* you
have speaker disconnected and that pin location on motherboard connected to 
Phasor. You can set Low, Medium and High volume with three different DIP
positions. This doesn't affect Phasor music/sound however. To do that, you
must turn those two pots you asked about. Each controls either the left or
right stereo channel. Turning them clock-wise increases volume, and you
probably don't want this too high up, or sound gets distorted! Put both
on an equal setting, unless you want one channel louder/softer than the
other.

Phasor DIP switch emulation modes:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Native Phasor mode:   1: closed, 2: closed
Mockingboard  mode:   1: opened, 2: closed
Echo+         mode:   1: opened, 2: opened  (Never got this mode to work!)