DelayCalc BPM: Delay & Reverb

Type one tempo and every time-based value for that song comes out at once.

Delay times, LFO rates, reverb tails, loop lengths in odd meters, the key after a tempo change, and sample counts. No reopening a second calculator.

Dark enough to read in a studio, and every value copies with a tap.



■ Delay & LFO

Enter a BPM and every note value lines up with its delay time in ms and its LFO rate in Hz. Straight, dotted and triplet, plus 5- and 7-tuplets (5:4 / 7:4). Tap a note value for seconds and sample counts at 44.1 / 48 / 96 kHz.

It goes the other way too. Enter the ms or Hz you already have and get the BPM back, with the closest note values listed — so "what tempo is this pedal's 375 ms" takes one entry.

■ Reverb

Pre-Delay and Total Reverb Time from the tempo, with Decay and where the tail lands.

Then Tail Clearance: whether the tail ends before the next hit, and by how much. Clear, overlapping, or exactly on it — as a number rather than a guess.

The basis is stated on screen: Total Reverb Time includes Pre-Delay, quarter-note basis. Plugins define Reverb Time differently, and that is on screen too.

■ Tempo & Key

From a sample's original and target tempo: Tempo Change, Playback Speed, Semitones and Cents.

Then the key it lands on, in Camelot Key and Open Key, with the Harmonic Matches worth mixing into. Preserve Key (Master Tempo / Key Lock) treats the key as unchanged.

Enter the original duration and you also get the new length, its sample count, and how it fits into bars.

■ Loop Length

Bar and loop lengths from a time signature (3/4, 5/4, 5/8, 6/8, 7/8, 9/8 and more) in ms, seconds, Hz and sample count.

Or the other way: give it a length and get the tempo.

■ Library

Keep the setups you use, named, up to 50. Restoring brings back the page and the time signature, so you carry on where you were.




■ Where it earns its place

· Setting delay and LFO values in a DAW
· Keeping a reverb tail off the next hit
· Matching a delay pedal or hardware synth to the tempo by hand
· Getting the BPM and note value back from ms or Hz you already have
· Loop lengths in odd meters, and sequencer rates
· The key a sample lands on after a tempo change
· Lining effects up to tempo at a rehearsal or a live set

■ What it does and does not do

· Values use the project tempo, quarter-note based, so they match your DAW
· Reverb and delay tails are starting points. Set the final value by ear, to suit the source and the gear
· No microphone analysis, no DAW integration. You type, it answers

■ Quietly dependable

· Saved setups stay on the device. Nothing is sent to a cloud
· The core calculation works offline. Only the privacy policy opens a connection
· No account
· No ads
· No subscription. One purchase
· iPhone, iPad and Mac on that one purchase

■ Note values

1/1, 1/2, 1/2D, 1/4, 1/4T, 1/4D, 1/8, 1/8T, 1/8D, 1/16, 1/16T, 1/16D, 1/32, 1/32T, 1/32D
Advanced: 1/4 (5:4), 1/8 (5:4), 1/16 (5:4), 1/4 (7:4), 1/8 (7:4), 1/16 (7:4)