1. Computer Sound Synthesis 2 MUS_TECH 335 Selected Topics

2. David Griesinger Lexicon modulating delays in reverb

3. Lexicon-Style Reverb Predelay lowpass filters All-pass Combs Diffusion Modulated All-pass Delay All-pass low-pass filter

4. Building Blocks z -1 1-b  b   379 389 -x x 1 st -order recursive filter (low-pass) all-pass comb filters

5. Modulating Delay   908+Excursion Modulation rate ~ 1 Hz Excursion ~ 0.3 msec (12 samples @ 44.1)

6. Temporal Diffusion tinput a toutput a more than 10 msec

7. Waveguide Reverberation Julius Smith Other Methods for Creating Reverberation We can discuss later when covering waveguides

8. Feedback Matrix A Strautner & Puckette 1982 Jot & Chaigne 1991

9. Generic Effects Processor delay tone inputoutput output mix feedback feedback phase +/- 1 1 st order ??? ~ speed width on/off delay modulation

10. Control Signals/Modulators t a +1 * deviation + centerValue = a deviation centerValue t

11. “Flanging” delay.5 +1 metallic, zingy -1 whoosh, hollow +/- 1 delay 5 ms 200 Hz 20 ms 50 Hz

12. Chorusing delay modulation controls 10-25 msec inout

13. Panning and Positioning

14. Panning Methods 0.5 L (C) R amp position 0.7 L (C) R amp position Amplitude Panning Intensity or Power Panning

15. Panning Methods Near-field Monitoring: Greatest accuracy: Low Frequencies: amplitude panning High Frequencies: power panning Large-space Monitoring: power panning

16. Panning Inaccuracy L (C) R High position Low