11月2日 的 PocketMIDI: MIDI Keyboard 應用程式分析

PocketMIDI is a low-latency MIDI synthesizer and piano for Android, built for live performance. The core app is completely free — and everything it did for free before, it still does for free. Plug in a USB MIDI keyboard or play the on-screen keys: studio-quality sound with a latency target under 40 ms. No ads, no tracking, no subscription, no account. ━━━━━━━━━━━━━━━━━━━━━━ FREE — AND STAYING FREE ━━━━━━━━━━━━━━━━━━━━━━ No trial, no sign-up: • Four built-in instruments — Grand Piano (Salamander V3, A0–C8), Strings, Dark Pad, Synthesizer • USB MIDI keyboards and the multi-touch on-screen keyboard, 96-voice polyphony, velocity and sustain pedal • Arpeggiator, chord mode, transpose, metronome • Full synth editor — waveforms, ADSR, filter • Presets: save, load, export, import • Recording with piano roll and playback, exported as WAV or M4A audio • Performance monitor and every setting No feature that was free has been moved behind a purchase, and none will be. ━━━━━━━━━━━━━━━━━━━━━━ OPTIONAL ADD-ONS ━━━━━━━━━━━━━━━━━━━━━━ Want a bigger palette? 23 extra instruments are one-time purchases — buy them one at a time, or unlock all of them together. No subscription. • Keys — Upright Piano, Organ • Strings — Solo Violin, Violin Section, Viola Section, Cello Ensemble, Solo Contrabass, Harp • Brass — Trumpet, French Horn, Tenor Trombone • Woodwinds — Flute, Piccolo, Oboe, Clarinet, Bassoon • Percussion — Marimba, Xylophone, Glockenspiel, Tubular Bells, Timpani • Bass — Finger Bass, Pick Bass • Plus .mid export of your recordings, for editing as notes in a DAW — included with the all-sounds unlock Preview any add-on before you buy. Packs download on demand so the app stays small, then work offline like any built-in sound, with the same ADSR editor. Purchases are one-time and restore when you reinstall or change device. ━━━━━━━━━━━━━━━━━━━━━━ FEATURES IN DETAIL ━━━━━━━━━━━━━━━━━━━━━━ USB MIDI — connect any class-compliant keyboard over OTG. Note on/off and sustain (CC64) route straight to the audio engine. Optional auto-launch on connect. ON-SCREEN KEYBOARD — 2 octaves (C3–C5), up to 10 simultaneous touches, tap position sets velocity. ARPEGGIATOR — patterns, rates including triplets, octave span, gate, latch. Tap-to-type BPM synced with the metronome. Chord mode fires full chords and arpeggios as you play. SYNTH EDITOR — sine, saw, square, triangle; ADSR (attack and decay 1 ms–4 s, sustain 0–100%, release 1 ms–8 s); low-pass filter with cutoff and resonance. PRESETS — name and save instrument and synth settings, recall them instantly mid-performance, export and import as JSON. RECORDING — real-time piano roll, fixed-timeline playback with a moving playhead, pinch to zoom, drag to seek. METRONOME — 20–300 BPM; time signatures 2/4, 3/4, 4/4, 6/8, 7/8, 5/4; visual pulse. PERFORMANCE — live monitor for active voices, buffer size, sample rate, estimated latency and underruns. ━━━━━━━━━━━━━━━━━━━━━━ SUPPORT ━━━━━━━━━━━━━━━━━━━━━━ Free and paying users get the same support at the same priority. A bug in the free app is fixed with the same urgency as one affecting a purchase — buying doesn't move you up the queue, and not buying doesn't move you down it. jdevstudiocomm@gmail.com https://pocketmidi.jdevstudio.app/support.html ━━━━━━━━━━━━━━━━━━━━━━ TECHNICAL ━━━━━━━━━━━━━━━━━━━━━━ Oboe 1.9.0 (AAudio, OpenSL ES fallback) • ~4 ms buffer @ 192 frames, 48 kHz • automatic stream restart • Android 8.0+. Plays fully offline; the internet is used only to browse, preview and download add-ons. Salamander Grand Piano V3 samples by Alexander Holm, used under CC BY 3.0 with no modifications: https://creativecommons.org/licenses/by/3.0/