User`s manual

5
producing a clean output when this LED is lit. The next two LEDs are labeled “WARM.” This is the optimal operating range
for the Tube MP/C. At this level, the tube is producing an output signal which most would term “warm” (Whatever you would
like to call it is fine - simmering, toasty, etc.) You’ll find the output signal has an enhanced bottom to low mid quality with
smooth high frequency detail. The last LED is labeled “Clip.” This LED will light approximately 6dB before audible distortion
occurs. If this light flickers, do not panic. The unique design of the Tube MP/C allows the tube to distort well before any other
gain stage. When a tube goes into distortion it is a gradual process and tends to sound pleasing for a range before it turns
into a distortion box. After some use you’ll find the “sweet spot” of the Tube MP/C is with this light flashing fairly regularly.
You may find a “clipped” level is suitable for some applications.Note: Use the Tube Character display to aid in setting the
Gain Control.
Threshold Control
The Threshold control sets the point at which the compressor circuit will act on the input signal. Turning this control
counterclockwise lowers the threshold (adding more compression to a signal). Turning this control clockwise raises the
threshold. Setting the Threshold control is dependent on the Gain control. The easiest way to set the Threshold control is to
start with the control fully clockwise. After setting the Gain control, slowly turn the Threshold control counter-clockwise
(lowering the threshold) until you see the yellow (0dB) Threshold LED light. Now adjust the control (either lower or higher)
until you have the amount of compression you desire. Use the Gain Reduction meter as a visual guide to the amount of
compression applied.
Slope Switch
In its “out” position, the Tube MP/C’s compression ratio is an active 2.3:1 ratio. This means that for every 2.3dB over the
threshold the input signal rises, the compressor’s output will change by 1dB. This is a very mild and musical compression
ratio which is ideal for smoothing all types of signals. In its “in” position, the compression ratio is greater than 6:1. This is
typically called “soft limiting” as it allows only a 1dB change in signal level for any signal reaching over 6dB over the set
threshold. This setting is ideal for applications where exceeding a set level is undesirable (mixing, popping bass, digital
recording, etc.).
Speed Switch
The position of the Speed switch selects the release characteristics of the Tube MP/C’s compressor. The Fast position
allows the compressor to recover quickly once the signal falls below the threshold. The Auto position allows the compressor
to adjust itself depending on the characteristics of the input signal. Use the Fast setting when the signal has repetitive,
consistent characteristics (kick drum, snare, vocals, etc.). Use the Auto setting when the signal has varying characteristics
(long decaying notes alternating with quick notes, mix material, etc.).