gogobel — Audio output is a tone related to the striking of a cow bell or similar.
Audio output is a tone related to the striking of a cow bell or similar. The method is a physical model developed from Perry Cook, but re-coded for Csound.
ihrd -- the hardness of the stick used in the strike. A range of 0 to 1 is used. 0.5 is a suitable value.
ipos -- where the block is hit, in the range 0 to 1.
imp -- a table of the strike impulses. The file marmstk1.wav is a suitable function from measurements and can be loaded with a GEN01 table. It is also available at ftp://ftp.cs.bath.ac.uk/pub/dream/documentation/sounds/modelling/
ivfn -- shape of vibrato, usually a sine table, created by a function.
A note is played on a cowbell-like instrument, with the arguments as below.
kamp -- Amplitude of note.
kfreq -- Frequency of note played.
kvibf -- frequency of vibrato in Hertz. Suggested range is 0 to 12
kvamp -- amplitude of the vibrato
Here is an example of the gogobel opcode. Play gogobel.csd, and marmstk1.wav,
Example 425. Example of the gogobel opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o gogobel.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 kfreq = 200 ihrd = 0.5 ipos = p4 kvibf = 6.0 kvamp = 0.3 asig gogobel .9, kfreq, ihrd, ipos, 1, 6.0, 0.3, 2 outs asig, asig endin </CsInstruments> <CsScore> ;audio file f 1 0 256 1 "marmstk1.wav" 0 0 0 ;sine wave for the vibrato f 2 0 128 10 1 i 1 0.5 0.5 0.01 i 1 + 0.5 0.561 i 1 + 0.5 0.9 e </CsScore> </CsoundSynthesizer>