Uses FM synthesis to create a tublar bell sound. It comes from a family of FM sounds, all using 4 basic oscillators and various architectures, as used in the TX81Z synthesizer.
All these opcodes take 5 tables for initialization. The first 4 are the basic inputs and the last is the low frequency oscillator (LFO) used for vibrato. The last table should usually be a sine wave.
The initial waves should be:
ifn1 -- sine wave
ifn2 -- sine wave
ifn3 -- sine wave
ifn4 -- sine wave
kamp -- Amplitude of note.
kfreq -- Frequency of note played.
kc1, kc2 -- Controls for the synthesizer:
kc1 -- Mod index 1
kc2 -- Crossfade of two outputs
Algorithm -- 5
kvdepth -- Vibrator depth
kvrate -- Vibrator rate
Here is an example of the fmbell opcode. It uses the files fmbell.orc and fmbell.sco.
Example 1. Example of the fmbell opcode.
/* fmbell.orc */
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
; Instrument #1.
instr 1
kamp = 10000
kfreq = 880
kc1 = 5
kc2 = 5
kvdepth = 0.005
kvrate = 6
ifn1 = 1
ifn2 = 1
ifn3 = 1
ifn4 = 1
ivfn = 1
a1 fmbell kamp, kfreq, kc1, kc2, kvdepth, kvrate, ifn1, ifn2, ifn3, ifn4, ivfn
out a1
endin
/* fmbell.orc */
/* fmbell.sco */
; Table #1, a sine wave.
f 1 0 32768 10 1
; Play Instrument #1 for three seconds.
i 1 0 3
e
/* fmbell.sco */