Backing Pocket: Chord Backing

Write a chord progression measure by measure and a drummer, a bassist and a pianist play it back, with the current chord lit up. Loop only the hard measures, practice in all 12 keys, and send a stand-ready chart PDF. For music students, jazz and pop players, and teachers who practice with a backing band every day. 8 styles: medium swing, bossa nova, jazz ballad, pop 8th notes, funk 16ths, blues shuffle, jazz waltz, slow 3/4. No sign-up, no ads, no subscription, no internet. Buy once and you are done; songs and logs stay on this phone. ■ Good to know first · Not karaoke or recorded backing tracks: drums, bass and piano are synthesized on your device · No sheet music, melodies or lyrics. You write the chord progression (pasting text works too) · It does not pick out chords from songs you hear, does not use the microphone, and does not export audio or MIDI (charts save as PDF) · No server: data stays on this phone; move it with one backup file · No permissions required ■ A chart that lights up Four measures per line like a hand-written chart (root big, quality small above). The cursor follows the beat, the current chord lights up, and three lanes (drums, bass, piano) show this measure's accompaniment. A screen-sync setting covers Bluetooth delay. ■ Editing charts · A chord per beat; an empty beat continues the previous chord, an empty measure is “%” · Chord keyboard: 12 roots, 34 chord types (sus, dim, aug, m7b5, 7b9, 7#9, alt, 9, 11, 13, 6/9 and more), slash bass, N.C. · Repeat signs and 1st/2nd endings, played as sheet music reads · Type or paste text like “| Dm7 G7 | Cmaj7 | % |”. It reads D-7, C^7, Bø, G7(b9) and reports anything it cannot read instead of changing it ■ The band, built from rules A walking bass that varies every round, a bass line per style, rootless jazz voicings with smooth voice leading, ride and pedal hi-hat, cross-stick clave, ghost notes and end fills. Varied samples and human timing keep it from sounding like a machine. ■ Practice tools · Tempo 40–300 BPM, changeable while playing · Tempo ladder: for example +5 every 2 rounds up to 150 · Swing ratio 50–75% · Transpose ±11 semitones; chart names follow · Rounds, then end on the first chord, or play until you stop · Count-in, tap a measure to start there · Mixer: mute the piano and comp yourself, or mute the bass and walk it yourself ■ Lesson tools · Loop section: pick start and end measures; the ladder and round count follow it · Key cycle: move up a 4th, 5th, half step or whole step every few rounds to play the progression in all 12 keys · Chords and scales: chord tones and improv scales for every chord with a keyboard diagram (default suggestions from each chord alone, as the app says) · Bb / Eb / F instrument notation changes names in charts, scales and PDF, not the sound · Chart PDF: A4 for the stand or to send to students, with repeats, endings, a chords and scales table and your practice log ■ What builds up Each song keeps its chart, style, tempo, ladder, mixer and memo. Practice over 20 seconds is logged with date, time and tempo range; home shows each song's best tempo and this week's days and minutes. Four text sizes, adjustable reference pitch A4 (415–466 Hz), Bb/Eb/F notation, screen sync, count-in. ■ First launch Five copyright-free practice progressions are included (chords only, no titles, melodies or lyrics). “Clear example” removes them. ■ Backup and contact Export songs, practice logs and settings as one file and restore it on a new phone. For questions or bugs, use “Contact” inside the app. No ads. No in-app purchases. No subscription. Buy once.

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