Write a money amount in words for a cheque (EN/ES/FR/DE): you give the currency names, no rates; words or 56/100 cents.

Feedback delay decay: dB lost per repeat, repeats to fall 60 dB and total tail time in ms from delay and feedback.

Convert semitones, cents, speed percent, two frequencies or two BPMs into one varispeed ratio with all equivalents.

Note name, MIDI number and Hz at a fret on guitar, bass, ukulele or violin strings, with alternate tunings.

Tap tempo from tap timestamps in ms: mean and median BPM, interval spread and jitter percent.

The 7 triads and 7th chords of a key (major, natural or harmonic minor) with spelled notes and Roman numerals.

Song length in seconds and m:ss from bars, BPM and time signature, plus bars or BPM needed for a target length.

Note values 1/1 to 1/32 (straight, dotted, triplet) at a BPM as ms, LFO Hz, samples and MIDI ticks.

Shift a key by semitones with the right sharp or flat spelling, its relative major or minor, signature and capo shapes.

The next upcoming public holidays in a country within the coming year, with days until each.

Camelot wheel code for a musical key and its harmonic-mixing matches; optionally test if two keys mix.

The date N US trading days after (or before) a given date, skipping weekends and NYSE holidays, with the starting day's status.

Count US trading days between two dates (inclusive), with weekends and NYSE holidays removed and the holidays listed.

US monthly equity option expirations for a year: third Friday, moved to Thursday on a market holiday; flags triple witching.

Public holidays for a country and year (about 100 countries), flagging regional-only holidays and weekday of each.

Food to prepare for a guest count by course (appetizer, main, side, salad, dessert, bread) with kid and appetite multipliers.

Backwards timeline from the event start: milestones given as minutes before start become 12-hour clock times, earliest first.

Convert 1-3999 to Roman numerals or read Roman numerals as numbers, strict or lenient (IIII, IC), additive style option.

A whole number as French words: cardinal and ordinal, France/Belgium/Swiss forms (septante), 1990 hyphen spelling.

Drinks for an event from a first-hour and later-hours rule per guest, split into beer, wine and liquor, with bottle counts.