User manual MOOG MF101

[. . . ] Understanding and using your moogerfooger® MF-101 Lowpass Filter Welcome to the world of moogerfooger® Analog Effects Modules!Your Model MF101 Lowpass Filter is a rugged, professional-quality instrument, designed to be equally at home on stage or in the studio. Its great sound and classic effects come from the state-of-the-art all-analog circuitry, designed and built under Bob Moog's personal direction. Your MF-101 is a direct descendent of the original modular MoogTM synthesizers. [. . . ] That tone interacts with your instrument's tone when you play your instrument through the filter. The 2-POLE 4-POLE switch selects whether the signal goes through half the filter (2pole) or the entire filter (4-pole). 2-POLE has a bright sound, while 4-POLE has a deeper, mellow quality. The Envelope Follower Section The AMOUNT knob, the SMOOTH-FAST switch, and the ENV light are all part of the Envelope Follower section. The AMOUNT knob determines how much the envelope signal is used to open and close the filter. When the knob is counterclockwise, the envelope signal has no effect on the filter. When the knob is clockwise, the envelope signal opens and closes the filter as much as five octaves. The SMOOTH-FAST switch determines whether or not the envelope signal is smoothed out. Some sounds (like guitar chords) have long, rough envelopes, and they often sound better if the envelope is smoothed out before going to the filter. Other sounds (like snare drum) are quick and sharp, and sound really good with the switch in the Fast position. The ENV light shows how strong the envelope signal voltage is at any one time. The stronger the audio input, the brighter the ENV light will be. Audio Input Level and Mixing The DRIVE and MIX controls and the LEVEL light are all part of the audio input level and mixing circuitry. The DRIVE control adjusts the input gain. With this control you can set the right input gain for virtually any instrument or line-level signal source. Turn this control counterclockwise for strong input signals, and clockwise for weaker sound sources. The DRIVE control is always active, even when the MF-101 is in BYPASS mode. The MIX control crossfades from the straight input signal to the filtered signal. Use this control to get any mixture of filtered and unfiltered sound. The LEVEL light tells how strong the input signal is after being adjusted by the DRIVE control. As the signal level increases, the light goes from off, to green, to yellow, and finally to red. Very weak signals do not light up this light at all. When the light is green, the signal is below the level that results in audible distortion. When the light is yellow, some low order distortion may be audible, giving the sound a subtle warm analog quality. When the signal is strong enough to drive the light into the red, the distortion at the output becomes stronger and more distinctly audible. [. . . ] These will short out the +5. 7 volt supply to the ring contacts. This voltage is current-limited, so you won't burn anything out, - but no pedal will work in any of the pedal control jacks if a tip-sleeve plug is plugged into even one of the pedal jacks. Applying a varying voltage to the tip terminal of a pedal control input jack has the same effect as turning the corresponding knob. A voltage change of about 5 volts at the tip terminal is usually equivalent to turning the corresponding knob through its entire range. [. . . ]