Designing Games with Game Maker - YoYo Games

To apply a sound effect to a particular sound you can either indicate this when defining the
sound resource or you can use the following function
sound_effect_set(snd,effect) Sets a (combination of) sound effect(s)
for the indicated sound. effect can be any of the following values:
se_none
se_chorus
se_echo
se_flanger
se_gargle
se_reverb
se_compressor
se_equalizer
You can set a combination of effects by adding up the values. So e.g. you can
use
sound_effect_set(snd,se_echo+se_reverb);
to get a combination of echo and reverb effects.
All effects have some default settings. You can change these settings once an effect has been
applied to a sound. The order here is crucial. You first apply the effect to the sound and next
set the parameters for it. Once you reapply effects to the sound, the settings are gone and
you have to set them again. Note that all parameters must lie in a particular range, which is
indicated below. The following functions exist for changing effect parameters:
sound_effect_chorus(snd,wetdry,depth,feedback,frequency,wav
e,delay,phase) Sets the parameters for the chorus effect for the indicated
sound. The following parameters can be set:
wetdry Ratio of wet (processed) signal to dry (unprocessed) signal. (range: 0
to 100, default 50)
depth Percentage by which the delay time is modulated by the low-frequency
oscillator, in hundredths of a percentage point. (range: 0 to 100, default 25)
feedback Percentage of output signal to feed back into the effect's input.
(range: -99 to 99, default 0)
frequency Frequency of the LFO. (range: 0 to 10, default 0)