LFO/Divider/Sample and Hold/Noise/Decay/Slew 6 in one module

The Q157 SH++ is a Sample and Hold module surrounded by accessory func- tions on a single-wide panel. There are 5 sections including an LFO with square and sine wave outputs, a frequency/gate divider, noise source with low-pass filtering, and a slew limiter with automatic looping. The slew limiter section also produces a decay envelope generator.
Several of the sections are connected together in a musically useful way to cre- ate modulation of oscillators and filters with minimal patching. The exception is the Decay/Slew section which operates stand-alone by default. All sections can be used together or separately.

The LFO provides square wave and sine wave outputs simultaneously with an LED indicating speed. A range switch selects between slow, fast and off for interactive playing. The LFO can be used to provide vibrato to oscillators, clocks to sequencers, or gates for the Sample and Hold section.

The Divider section automatically receives its input from the LFO's square wave unless a plug is inserted into its IN jack. The default division is /2, with jumpers on the circuit board offering /3, /4, /5, /6, /7 and /8. Dividing gates can be useful for sequencer patches, arpeggiations, even sub-octave waveform generation. An LED shows status of the output.

The Sample and Hold section receives its gate from the LFO unless a plug is inserted into its GATE jack. The GATE input is level sensitive and can be trig- gered by slow-moving waveforms or even noise. The sample and hold input is automatically connected to the noise section if there is no plug in the IN jack.

The Noise section provides a white noise filtered by a 2-pole low-pass filter. The knob can also be jumpered as a volume control if desired.

The Decay/Slew section provides portamento for keyboard pitch, creates enve- lopes from gates, or delays gate signals. The knob sets the speed. The curve is jumper-able from linear to exponential. Without a plug inserted into the IN jack, the slew mode automatically retriggers to create a trapezodial LFO wave- form. In decay mode, a gate produces a decaying envelope to drive percussive patches. An LED shows status of the output.

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• 60 mA +15V
• 60 mA -15V
• 50 mA 5V

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