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tuning...
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@GrandpaBond
GrandpaBond committed Jul 15, 2023
1 parent 3cfaf2b commit c5e8090
Showing 1 changed file with 32 additions and 30 deletions.
62 changes: 32 additions & 30 deletions main.ts
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Expand Up @@ -10,36 +10,38 @@ It can involve up to three separate sound parts that will then be played consecu
to give a smoothly varying result when spliced together.
Internally, sound effects are specified by a string of 72 decimal digits, broken into several
fields (many of which appear to be either obsolete or redundant). On each invocation the core
function createSoundEffect() takes eight arguments and works quite hard to encode them into their
respective fields.
fields (many of which appear to be either obsolete or redundant).
Notable SoundExpression string fields are laid out as follows:
[0]: Wave (1 digit)
[1-3]: Start Volume (4 digits)
[5-8]: Start Frequency (4 digits)
[9-12]: Duration (4 digits)
[13-17]: other stuff (5 digits)
[13-17]: Interpolation (5 digits)
[18-21]: End Frequency (4 digits)
[22-25]: other stuff (4 digits)
[22-25]: --other stuff-- (4 digits)
[26-29]: End Volume (4 digits)
[30-71]: other stuff (42 digits)
[30-71]: --other stuff-- (42 digits)
On each invocation the core function createSoundEffect() takes eight arguments and works quite hard
to encode them into their respective fields.
We would like to be able to repeatedly vary the overall pitch or volume of any given FlexFX.
Conventionally, that would require reconstructing all three sound effects from scratch for each
performance (or saving a wide range of 3*72-character strings we had prepared earlier).
Instead we choose to selectively overwrite certain 4-digit fields within the three soundExpressions
in our three-part FlexFX, to "tune" its pitch and volume as we require.
*** It is acknowledged that this is a DANGEROUS PRACTICE that relies on the internal
*** representation not changing, but it is believed that the performance gains justify it!
*/
/* NOTE: The built-in enums for sound effect parameters are hardly beginner-friendly!
By renaming them we can expose somewhat simpler concepts, but this only works
if we pass them over a function-call as arguments of type: number.
*/


// NOTE: The built-in enums for sound effect parameters are hardly beginner-friendly!
// By renaming them we can expose somewhat simpler concepts.
// (This only works if we pass them over a function-call as arguments of type: number.)
// simplify the selection of wave-shape...
// Simplify the selection of wave-shape...
enum Wave {
//%block="Pure"
SINE = WaveShape.Sine,
Expand All @@ -52,7 +54,7 @@ enum Wave {
//%block="Noisy"
NOISE = WaveShape.Noise,
}
// simplify the selection of frequency-trajectory...
// Simplify the selection of frequency interpolation trajectory...
enum Attack {
//% block="Slow"
SLOW = InterpolationCurve.Linear,
Expand Down Expand Up @@ -456,33 +458,33 @@ namespace flexFX {

/*
DOO 300% 80%
SAW LOG NONE 100% 90% | 10%
SQU LIN NONE 100% 70% | 90%
SAW LOG NONE 100% 90% | 15%
SQU LIN NONE 105% 70% | 85%
*/
create2PartFlexFX(MoodSound.DOO.toString(), 3.00, 0.7,
Wave.SAWTOOTH, Attack.FAST, Effect.NONE, 1.00, 0.9,
Wave.SQUARE, Attack.SLOW, Effect.NONE, 1.00, 0.6, 0.1);
Wave.SQUARE, Attack.SLOW, Effect.NONE, 1.05, 0.6, 0.15);

/*
QUERY 110% 20%
SQU LIN NONE 100% 100% | 20%
SQU CUR NONE 150% 20% | 80%
SQU CUR NONE 150% 30% | 80%
*/
create2PartFlexFX(MoodSound.QUERY.toString(), 1.10, 0.2,
Wave.SQUARE, Attack.SLOW, Effect.NONE, 1.00, 1.0,
Wave.SQUARE, Attack.MEDIUM, Effect.NONE, 1.50, 0.2, 0.2);
Wave.SQUARE, Attack.MEDIUM, Effect.NONE, 1.50, 0.3, 0.2);

/*
UHOH 110% 40%
SAW LOG NONE 120% 100% | 20%
SILENCE | 20%
100% 80%
SQU LIN NONE 90% 75% | 60%
95% 100%
SQU LIN NONE 85% 75% | 60%
*/
createDoubleFlexFX(MoodSound.UHOH.toString(),
1.10, 0.4, Wave.SAWTOOTH, Attack.FAST, Effect.NONE, 1.20, 1.0,
1.00, 0.8, Wave.SQUARE, Attack.SLOW, Effect.NONE, 0.90, 0.75,
0.95, 1.0, Wave.SQUARE, Attack.SLOW, Effect.NONE, 0.85, 0.75,
0.2, 0.2);

/*
Expand All @@ -498,23 +500,23 @@ namespace flexFX {

/*
DUH 100% 60%
SQU LIN NONE 95% 100% | 30%
SQU LIN NONE 110% 80% | 10%
SQU LIN NONE 95% 100% | 10%
SQU LIN NONE 110% 80% | 30%
SQU LIN NONE 66% 40% | 60%
*/
create3PartFlexFX(MoodSound.DUH.toString(), 1.00, 0.6,
Wave.SQUARE, Attack.SLOW, Effect.NONE, 0.95, 1.0,
Wave.SQUARE, Attack.SLOW, Effect.NONE, 1.10, 0.8,
Wave.SQUARE, Attack.SLOW, Effect.NONE, 0.66, 0.4, 0.3, 0.1);
Wave.SQUARE, Attack.SLOW, Effect.NONE, 0.66, 0.4, 0.1, 0.3);

/*
WAAH 100% 10%
SAW CUR NONE 140% 90% | 70%
SAW LIN NONE 110% 20% | 20%
SAW LIN NONE 30% 5% | 10%
WAAH 100% 10%
SAW CUR NONE 140% 100% | 70%
SAW LIN NONE 110% 20% | 20%
SAW LIN NONE 30% 5% | 10%
*/
create3PartFlexFX(MoodSound.WAAH.toString(), 1.00, 0.1,
Wave.SAWTOOTH, Attack.MEDIUM, Effect.NONE, 1.40, 0.9,
Wave.SAWTOOTH, Attack.MEDIUM, Effect.NONE, 1.40, 1.0,
Wave.SAWTOOTH, Attack.SLOW, Effect.NONE, 1.10, 0.2,
Wave.SAWTOOTH, Attack.SLOW, Effect.NONE, 0.3, 0.05, 0.70, 0.20);

Expand Down Expand Up @@ -786,7 +788,7 @@ function doSound(choice: number) {
break;
case 7: flexFX.performFlexFX(MoodSound.MOAN.toString(), 500, 200, 700);
break;
case 8: flexFX.performFlexFX(MoodSound.DUH.toString(), 400, 200, 700);
case 8: flexFX.performFlexFX(MoodSound.DUH.toString(), 300, 200, 500);
break;
case 9: flexFX.performFlexFX(MoodSound.WAAH.toString(), 600, 200, 1100);
break;
Expand All @@ -799,7 +801,7 @@ let span = 0;
let pitch = 0;
let ave = 0;
let gap = 0;
let choice = 6;
let choice = 8;
basic.showNumber(choice + 1);
music.setBuiltInSpeakerEnabled(false);

Expand Down

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