Legacy version, now discontinued. Great-sounding Baxandall EQ designed to emulate an Ampeg B-15 tone stack.

From the manual:

“Volume: Sets the overall level of the output for the Linden, it is located after the EQ circuit and provides a low impedance unbalanced output.

Treble: the treble control adjusts the high frequency content of the Linden E.Q, use this control to give your bass sound definition, or to roll back highs for a round full sound.

Bass: The bass control sets the content of low frequencies; this control is voiced to allow powerful bass that stays much tighter than modern E.Q. circuits, you can also use this control to cut basses that have unruly bottom end content.

Toggle: The toggle gives you a choice of two treble frequencies for your treble control, one modern with higher fidelity and one with more of a vintage warmer sound.

Push/Pull: the bass control is a push/pull type that has a slightly different feel when turning it because of the included switch, when the pot is pulled up, it adds deeper unfiltered lows for a fatter and more wooly tone.”