Fender J.A.M. 25-Watt 1x12 Guitar Practice Amp 1990 - 1996. INPUT 1 - A high impedance, high sensitivity plug-in connection for instruments. INPUT 2-Plug-in connection for instruments. This input exhibits a lower input sensitivity than INPUT I and is useful with active preamp guitars, and will provide a darker tone with passive guitars. Both inputs are identical when used simultaneously. (Note: Selection of either of the following preset buttons C, D, E or F will release the previously selected preset button.) NORMAL/BRIGHT--Activates the BRIGHT preset in NORMAL mode for a clear, undistorted sound with a mild boost in the upper mid and high E. frequency range. Useful for adding brilliance to a guitar with humbucking pickups. This is the classic Fender clean sound, ideal for a crisp rhythm guitar part. NORMAL/FULL-Activates the FULL preset in NORMAL mode. Also used for clean playing, this preset features a flatter frequency response than the BRIGHT preset (item C) resulting in a fuller guitar sound. Great preset for a mellower jazz sound. DRIVE/CRUNCH-Activates the CRUNCH preset in the DRIVE mode, useful for semi-distorted rhythm or lead playing. This preset rearranges the gain structure of the amplifier in order to provide more gain for generating distortion without a large increase in apparent loudness. It also automatically switches in special soft clipping circuitry to emulate the sound of the most popular tube amplifiers in the market today. DRIVE/LEAD--Activates the LEAD preset in the DRIVE mode, useful for full out lead playing and metal power chords with lots of sustain. This preset further modifies the gain structure of the amplifier and also activates the soft clipping circuitry. CONTOURAdjusts the overall tone quality of all presets without affecting the signal level. Low CONTOUR settings will provide boost/emphasis in the midrange frequencies whereas a higher setting (7 or above) will notch the midrange to produce sounds characteristic of most metalmusic when in the DRIVE modes. VOLUME- Adiusts the overall loudness of the amplifier. (Note: this control does not affect the volume of the TAPE INPUTS (item N)). REVERB--Adjusts the overall amount of reverberated signal mixed with the original dry signal for all four preset sounds. RATE-Adjusts the sweep rate of the chorus generating circuitry. A lower setting corresponds to a slower rate of s w e e p . CHORUS INDICATOR_-This LED is illuminated w h e n t h e c h o r u s circuits are active. The intensity of the LED is modulated by the chorus sweep LFO to give a visual indication of the sweep rate. DEPTH-Adjusts the intensity of the chorus effect. Al o w e r setting will introduce a subtle yet distinct effect. A higher setting will create a more dramatic effect. With both the RATE (item I) and DEPTH controls set midway or higher, a variety of vibrato/ tremolo type effects can be achieved. CHORUS SELECT-Activates the CHORUS mode for use with any of the four preset sounds. T A P E INPUTS~Plug-in connection for any line level (500mV) stereo or mono signal. This signal is mixed into the power amp along with the instrument signal from the preamp. It has fixed gain and is unaffected by any of the front panel controls; however, the signal will be affected by any device inserted between the PREAMP OUT (item O) and the POWER AMP IN (item P. It is useful for patching in a CD or tape player, rhythm machine or other signal source to be used as accompaniment for practice or performance. The output level control of the external signal source is used to control its o w n volume while the front panel VOLUME (item H) control is used for the instrument in order to obtain a balance. PREAMP OUT--This jack provides an unbalanced o u t p u t signal from t h e preamp and TAPE INPUTS (item N). This output can be used in conjunction with the POWER AMP NI (item P) jack as a patch point for effects units (i.e. as an EFFECTS LOOP). This signal can also be used to feed recording and sound reinforcement mixers or to drive other amplifiers as slaves. This is done by connecting a standard guitar cord from the PREAMP OUT iack of the master amplifier to the POWER AMP IN jack of the slave POWERAMP IN--This unbalanced jack inputs signal directly to the power amp. It automatically disconnects the preamp signal when used. This is useful when using the EFFECTS LOOP option or using the JAM as a slave amp. HEADPHONES--This jack provides an output to standard stereo or mono headphones for private listening. NOTE: Use of this jack automatically disables the main speaker. CAUTION: Prolonged listening at high levels may be hazardous to your hearing! This jack can also be used as an unbalanced line output, which is post EFFECTS LOOP, by using either a stereo or mono 1/4 inch phone plug connection. POWERINDICATOR- When this indicator is illuminated t h eA M is receiving power. POWERSWITCH-Turns AC powerONandOFF. When the switch is OFF the amplifier is completely shut down.