User manual LEXICON LXP-15

[. . . ] LXP-15 Multi-Effects Processor Owner's Manual Unpacking and Inspection After unpacking the LXP-15, save all packing materials in case you ever need to ship the unit. Thoroughly inspect the LXP-15 and packing materials for signs of damage. Report any shipment damage to the carrier at once; report equipment malfunction to your dealer. Notice This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer's instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC Rules, which are designated to provide reasonable protection against such interference in a residential installation. [. . . ] Sounds seem to change in pitch when generated by moving objects as they approach and recede from us. Our perception of sounds changes as we approach their source, and as we hear them in different settings. Even the difference in the amount of time it takes a sound to reach our two ears contributes to the audio clues we use to identify sounds and to accurately locate their sources. All of these characteristics can be used to simulate environments, to create the effect of sounds reaching us from a great distance, of performances in vast halls or tiny rooms. The basic parameters of different environments have already been defined and are at your disposal when creating your own effects. Sounds and Effects 4-1 LXP-15 Owner's Manual Lexicon Reflections When a sound is reflected from walls and other surfaces, it loses some of its high frequency content. If the surface is soft, or padded, such as a curtain or rug, more high frequency content will be lost than if the surface is hard like tile or paneling. Harder surfaces give rise to more reverberation; they are more "live". True echo occurs when a sound bounces off an acoustically hard surface; its return is heard as a distinct repetition of the original sound. When synthesizing an echo, the level and the high frequency content of the delayed sound, relative to the original sound in the output mix, gives audible clues as to the hardness of the reflecting surface(s). The intial delay time determines the impression of the relative distance between the sound source, the imaginary reflecting surface, and the listening position. Recirculation of the delayed sound (feedback) provides multiple repetitions, and suggests two or more reflective surfaces that are bouncing the sound back and forth. An echo of around one-tenth of a second (100 milliseconds) delay time can be heard as a distinct repetition of the original, but is so close that it is heard more as a rhythmic enhancement rather than as a separate sound. Often, the delay time is carefully adjusted so that a simple relationship exists between the tempo of the music and the delay time. On drums, the slap is often positioned on the opposite side of the stereo field from the original sound. Careful use of slap echoes can increase the rhythmic density and spatial interest of a musical arrangement. The "Tempo" patch source of the LXP-15 can be used to automatically synchronize slap rhythms to a wide range of MIDI tempos. Ambient echo effects simulate sound reflections from room surfaces -- with random reflections, a gradual decay of overall level, and a gradual narrowing of the bandwidth. If the reflected sound continues to bounce back and forth between surfaces, it provides a long decaying "tail". To produce this effect, use 30-100ms of delay, in conjunction with feedback. Experiment with Hi and Lo cut filters to simulate different absorption characteristics of the reflecting surfaces (and of the air between them). To further enhance diffusion, try very small amounts of LFO modulation of delay time at a slow rate. Variation in the amount of feedback corresponds to the hardness of the imaginary reflecting surfaces, and use of rolloff can simulate the effects of air absorption on the high end of the sonic spectrum. Echo Slap Echoes Ambient echo Plates Plate effects were originally generated by large, thin sheets of metal suspended upright under tension on springs. [. . . ] If the unit does not reset itself, turn the power OFF, then ON to resume normal operation. Low Voltage Temperature extremes may cause the LXP-15 to exhibit unpredictable behavior. If the unit has been subjected to temperatures below 32°F (0°C) or above 95°F (35°C), it should be turned off and allowed to return to normal temperature before use. The unit may be damaged by exposure to temperatures below -22°F (-30°C) or above 167°F (75°C), or by exposure to humidity in excess of 95%. If a unit exposed to such conditions fails to operate after it returns to a normal operating temperature, contact Lexicon Customer Service. Overheating No output from the LXP-15. [. . . ]