Sounds and Music
There are three ways to incorporate sounds into your MSW Logo procedures: Sound, SoundOn/SoundOff and Playwave.
Sound [<frequency> <duration>]
Using the Sound [<frequency> <duration>] command. eg sound [523 200] will play the note "C" for 200 "clock ticks" (a clock tick is approximately 1/60th of a second).
Musical Note |
Frequency (Hz) |
'Scale' |
A |
440.00 |
do |
A# |
466.16 |
- |
B |
493.88 |
re |
C |
523.25 |
- |
C# |
554.37 |
mi |
D |
587.33 |
fa |
D# |
622.25 |
- |
E |
659.26 |
sol |
F |
698.46 |
- |
F# |
739.99 |
la |
G |
783.99 |
- |
G# |
830.61 |
ti |
A2 |
880.00 |
do |
For further information see: http://www.ora.com/reference/dictionary/terms/S/Scale.htm
SoundOn/SoundOff
This command gives more control than the previous command. In this case the sound will play until it is turned off.
soundOn 500
wait 250 ; waits 250 'clock ticks'
soundOff
Playwave "<file location><file name><flags>
This command may be used to play a ".WAV" file from a disk.
playwave "C:\\apw\\sounds\\clapping.wav 1 + 8
The "flags" indicate how you want the sound played:
0 = Synchronous does not return until completed. (ie wait until done)
1 = Asynchronous returns immediately while sound is still playing. (ie concurrent)
2 = Don't use the default sound if the specified one cannot be found.
8 = Continue to loop the sound until another sound command is issued.
16 = Don't stop an already playing sound.
NOTE: You must leave a space after playwave and before the quotation mark. You must use the double backslash. Flags can be combined by adding them together.
For information on MIDI see here.