Lexicon PCM 80 manual Mstr Fbk, Mstr X-Fbk, Voices 1-6 Fbk, X-Fbk

The Algorithms and Their Parameters

Parameters in this row provide level and phase setting for feedback of individual voices, as well as a master feedback parameter for all voices. In the Glide>Hall algorithm, a duplicate set of parameters is included for cross-feedback.

Master

AMaster Feedback control is available in effects which have a feedback level control for each voice. It allows the feedback level for all voices to be simulta- neously adjusted over a range of 0-100%.

Voices

In the 4-Voice algorithms, four voice controls are provided for adjustment of the level and polarity of signals recirculated back to the input of individual voices. Note that, as Voices 1 and 2 and Voices 3 and 4 are paired, caution should be observed not to create feedback within a pair which exceeds more than 100%.

In the Chorus+Rvb and the M-Band+Rvb algorithms, six voice parameters control the feedback level of the voice delays. Voices 1, 2, and 3 Fbk control the individual voice feedback levels from the left channel voice delay outputs to the left channel delay feedback input. Voices 4, 5, and 6 Fbk control the individual voice feedback levels from the right channel voice delay outputs to the right channel delay feedback input.

The range of these parameters is from +100% down to 1% (Phase Normal feedback), 0% (Off), –1% up to –100% (Phase Inverted feedback).

In the Glide>Hall algorithm, the Feedback row provides both Feedback and Cross Feedback parameters as described below. Press Load/✱ at each row position to toggle between Feedback and Cross Feedback parameters.

Mstr Fbk, Mstr X-Fbk

These parameters allow the feedback and cross feedback levels for all voices to be simultaneously scaled over a range of 0-100%.

Voices 1-6 Fbk, X-Fbk

These parameters control the feedback and cross feedback levels and the polarity of the voice delays.

Voices 1, 2, and 3 Fbk control the individual voice feedback levels from the left channel voice delay outputs to the left channel delay feedback input.

Voices 1, 2, and 3 X-Fbk control the individual voice feedback levels from the left channel voice delay outputs to the right channel delay feedback input.

Voices 4, 5, and 6 Fbk control the individual voice feedback levels from the right channel voice delay outputs to the right channel delay feedback input.

Voices 4, 5, and 6 X-Fbk control the individual voice feedback levels from the right channel voice delay outputs to the left channel delay feedback input. The range of these parameters is from +100% down to 1% (Phase Normal feed- back), 0% (off), –1% up to –100% (Phase Inverted feedback).

The sum of all Fbk and X-Fbk values for each channel should be less than 100%.

Feedback/ Cross Feedback

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