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Music Production Calc – Pitch/Speed Varispeed Ratio Converter
x402
Music Production Calc – Pitch/Speed Varispeed Ratio Converter is a paid API for AI agents from music-production-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Converts semitones, cents, speed percent, two frequencies, or two BPMs into a unified varispeed ratio with all pitch/speed equivalents.
Price / call$0.02
Success—
StatusUnknown
How this service works
Convert semitones, cents, speed percent, two frequencies or two BPMs into one varispeed ratio with all equivalents.
Output
Returns a JSON object with the computed varispeed ratio, equivalent pitch shift in semitones and cents, octave fraction, speed percent, resulting frequency (hzAfter) and tempo (bpmAfter) if supplied, a human-readable summary, the detected input mode, the direction of change (isSpeedUp), and any warnings or disclaimers.
Example use cases
Tape varispeed pitch shift planning
“I want to pitch a sample up by 7 semitones using tape varispeed — what ratio and speed percent does that correspond to, and how does it affect a 98 BPM loop?”
Matching two sample frequencies
“I have a sample tuned to 432 Hz and I want to match it to 440 Hz — what's the varispeed ratio, how many semitones and cents is that shift, and how much faster will it play?”
BPM-to-BPM speed ratio for DJ mix
“I'm going from 128 BPM to 140 BPM — can you calculate the varispeed ratio, the semitone pitch change, and the speed percent increase for that transition?”
Technical details
Endpoint
GEThttps://music-production-calc.x402tookit.com/pitch-speed?utm_source=zero.xyzWhen to prefer
Use this endpoint whenever you need to interconvert any pitch or speed representation — semitones, cents, speed percent, frequency ratio, or BPM ratio — into a single coherent varispeed ratio with all equivalents. Prefer it over generic calculators when you need multiple representations at once (e.g. semitones AND speed percent AND ratio) or when you want to see the downstream effect on a specific frequency or tempo.
Side effects
- Missing or conflicting input group — only one input group (semitones, cents, speedPercent, fromHz+toHz, or fromBpm+toBpm) should be supplied at once
- Speed percent of -100 or below is invalid (zero or negative playback speed)
- Non-numeric or out-of-range values for frequency or BPM cause validation errors
- Partial frequency pair (only fromHz without toHz or vice versa) returns an error
- Partial BPM pair (fromBpm without toBpm) returns an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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