{"uid":"cap_McdQ-Qq3I8v04LyKG1jgG","slug":"music-production-calc-feedback-delay-tail-calculator-c7eff06d","name":"Music Production Calc – Feedback Delay Tail Calculator","description":"Feedback delay decay: dB lost per repeat, repeats to fall 60 dB and total tail time in ms from delay and feedback.","url":"https://music-production-calc.x402tookit.com/delay-tail?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["delayMs","feedbackPercent"],"properties":{"decayDb":{"type":"number","description":"How far the tail must fall to count as finished, in dB (default 60)"},"delayMs":{"type":"number","description":"Delay time in milliseconds"},"feedbackPercent":{"type":"number","description":"Feedback as a percent of the previous repeat, above 0 and below 100"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"source":{"type":["null","string"]},"tailMs":{"type":["null","number"]},"delayMs":{"type":["null","number"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"dbPerRepeat":{"type":["null","number"]},"tailSeconds":{"type":["null","number"]},"decayTargetDb":{"type":["null","number"]},"feedbackRatio":{"type":["null","number"]},"feedbackPercent":{"type":["null","number"]},"repeatsToTarget":{"type":["null","number"]},"firstRepeatLevels":{"type":["array","null"],"items":{"type":"object","properties":{"repeat":{"type":["null","number"]},"timeMs":{"type":["null","number"]},"levelDb":{"type":["null","number"]}}}}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_j6JGNN6ywWa3Vl3Dx1nRu","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates dB lost per repeat, number of repeats to fall a target dB, and total tail time in milliseconds from a delay time and feedback percentage.","exampleAgentPrompt":"What's the total tail time and dB lost per repeat for a delay set to 250ms with 70% feedback, decaying down 60 dB?","exampleUseCases":[{"title":"Dialing in delay tail for a mix","prompt":"I'm setting up a delay effect in my DAW with a 320ms delay time and 65% feedback — how many repeats will it take to fall 60 dB and how long will the full tail last in milliseconds?"},{"title":"Checking if delay clears before next bar","prompt":"My delay is set to 180ms with 55% feedback — can you calculate the total tail time in ms so I know if the echoes will die out before the next musical phrase at 120 BPM?"},{"title":"Designing a long atmospheric delay effect","prompt":"I want to create a lush, slow-decaying delay with 400ms delay time and 85% feedback — tell me how many repeats I'll get before it hits -60 dB and what the total tail time will be in seconds."}],"resultDescription":"Returns the dB lost per repeat, the number of repeats required to reach the decay target (default 60 dB), the total tail time in both milliseconds and seconds, the feedback ratio, and a table of the first several repeat levels with their time offsets in ms and level in dB. Also includes a summary string and optional disclaimer or degraded-mode flags.","failureModes":["Missing required delayMs or feedbackPercent query parameters returns an error","feedbackPercent of 0 or 100 (or outside 0–100 range) is invalid and will be rejected","Very high feedback values (e.g. 99%) yield extremely long tail times and many repeats — response may include a disclaimer","Negative or zero delayMs is invalid and will be rejected"],"whenToPreferThis":"Use this endpoint when you need precise mathematical computation of delay echo decay characteristics — specifically dB-per-repeat attenuation, number of audible repeats, and total tail duration in ms/seconds — given a delay time and feedback percentage. Ideal for music producers, audio engineers, and DAW automation agents that need to programmatically reason about delay effect parameters without opening a DAW or plugin.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:12:44.936Z","isFirstParty":false,"canonicalSlug":"music-production-calc-feedback-delay-tail-calculator-c7eff06d"}