Yamaha SPX900 SPX900 Owners Manual Image - Page 13

Reverberation is the warm musical "ambience" you experience when listening to music in a hall or other properlydesigned acoustic environment. The SPX900 offers several different reverb effects, simulating types of reverberation you would experience in halls, in smaller rooms, reverb effects ideally suited to vocals, the type of reverberation produced artificially by a plate reverberator. PARAMETERS ACCESSED BY THE PARAM KEY Reverb Time (REV TIME): 0.3 - 480 seconds (1. REV) HALL, 2. REV2 HALL&GATE, 7. REV7 VOCAL 1, 8. REVS VOCAL 2) 0.1 - 480 seconds (3. REV3 ROOM 1, 4. REV4 ROOM 2, 5. REV5 ROOM 3, 9. REVS PLATE, 10. REV10 PLATE&GATE) The length of time it takes for the level of reverberation at 1 kHz to decrease by 60 dB - virtually to silence. In a live setting, this depends on several factors: room size, room shape, type of reflective surfaces, and others. High Frequency Reverb Time Ratio (HIGH): 0.1 - 1.0 Natural reverberation varies according to the frequency of the sound. The higher the frequency, the more sound tends to be absorbed by walls, furnishings and even air. These two parameters allow alteration of the high-frequency and lowfrequency reverb times in relation to the overall reverb time. Diffusion (DIFFUSION): 0 - 10 The complexity of the many reflections that make up reverberation varies according to the shape of the room and its contents. In the SPX900 the term "diffusion" refers to the complexity of these reflections. If the DIFFUSION parameter is set to "0," minimum complexity and therefore a clearer, more straightforward reverb effect is produced. As the DIFFUSION value is increased, the complexity of the reflections increases producing a thicker, richer sound. Initial Delay (INI DLY): 0.1 - 200.0 milliseconds This represents the time delay between the direct sound of an instrument in a concert hall and the first of the many reflections that make up reverberation. High-pass Filter Frequency (HPF FRO.): THRU, 32 Hz- 1.0 kHz Permits rolling off the low-frequency content of the reverb signal above the set frequency. The HPF is OFF when set to THRU. Low-pass Filter Frequency (LPF FRQ.): 1.0 - 16 kHz, THRU Permits rolling off the high-frequency content of the reverb signal above the set frequency. The LPF is OFF when set to THRU. DIRECT SOUND ER REV -INI DLY REV DLY PARAMETERS ACCESSED BY THE INT PARAM KEY Early Reflection/Reverb Balance (ER/REV BAL.): 0 - 100% This parameter determines the level balance between the early-reflection portion and final reverberation portion of the reverb sound. At 100% only the early-reflection sound will be produced. At 0% only the final reverberation sound will be produced. A setting of about 50% produces both the earlyreflection and final reverberation sounds at equal level. Reverb Delay (REV DLY): 0.1 - 100.0 milliseconds Sets the delay between the beginning of the early reflections - the initial group of sparse reflections that precede the dense reverb sound - and the beginning of the reverb sound. Density (DENSITY): 0 - 4 This parameter determines the density of the reverb reflections (i.e. the average amount of time between reflections). A setting of 1 produces minimum reverb density for a more spacious sound, while a setting of 4 produces the most dense, "tightest" reverberation. Trigger Level (TRG. LEVEL): 0 - 100 Determines the level of the input signal required to trigger "opening" of the reverb program gate. At 100% only very high-level input signals will trigger the gate, while at 1% even the tiniest input signal will trigger the gate. Trigger Delay (TRG. DLY): -100 - +100.0 milliseconds Produces a delay between the time at which the gate is triggered and that at which it actually opens. Hold Time (HOLD): 1 - 24,000 milliseconds Determines how long the gate stays open, allowing the signal to pass. Release Time (RELEASE): 3 - 24,000 milliseconds Determines how long it takes for the gate to close fully after the HOLD TIME has ended. 11