VIBRANIAM

SAMPLER

Owner's Manual

Oboe · Low latency · 16 pads · Android

Closed beta

VIBRANIAM Sampler — Owner's Manual (DRAFT v0.1, English master)

0. Before you start

0.1 Safety and listening precautions

• Keep the volume low at first. Bass-heavy patterns and DRIVE can be loud.
• With headphones connected the app shows a monitoring warning. Lower the volume before you play.
• The microphone (SAMPLE) can cause feedback if the speaker is close to it. Use headphones when sampling.

0.2 Requirements

• Android 8.0 (API 26) or later.
• Stereo output at 44.1 kHz. Wired headphones or a USB audio device give the lowest latency.
• Optional: USB or Bluetooth LE MIDI keyboard.

0.3 Permissions

The app has no internet permission and collects no data.

0.4 Demo and unlock

The app is free to try. Each session allows 10 minutes of active use. The remaining time is shown as DEMO m:ss in the header; a banner appears one minute before the end. When the demo ends, the DEMO TERMINATA screen appears. Press SBLOCCA (price shown by Google Play) for the one-time purchase, or RIPRISTINA ACQUISTI if you already bought it. You can use SALVA LA SONG before leaving so nothing is lost.

1. Overview

Built on Oboe — minimum latency. The whole audio engine is written in native C++ on Google's Oboe library (AAudio low-latency path, Exclusive mode requested, float stereo at 44.1 kHz). The audio callback never allocates memory, takes locks or writes logs, so pads respond the instant you touch them. Actual latency depends on your device and output; the AUDIO OUTPUT panel (section 10) shows the real measured value on your phone.

VIBRANIAM Sampler is a 16-pad sampler and step sequencer with a native low-latency audio engine (Oboe, C++). It combines:

• 16 pads: 8 drum pads (1–8) and 8 pitched pads (9–16)
• 16-step sequencer with 512 patterns and a 512-slot song chain
• 13 built-in synth instruments plus your own samples
• Floating 2-octave keyboard with pitch-bend and mod wheels, MIDI input
• Per-pad channel FX, global FX rack, 16-channel mixer
• Export to WAV, FLAC, M4A (master or 16 stems) and MIDI; import of MIDI and audio files

1.1 Screen map

2. Quick start (5 steps)

1. Tap a pad: it plays. Pads 1–8 are drum sounds, 9–16 are pitched.
2. Press PLAY to start the sequencer; press RANDOM BEAT for an instant groove.
3. Tap cells in the sequencer grid to switch steps on or off.
4. Long-press a pad to select it, then use SAMPLE to record, or IMPORTA to load a file.
5. Use SAVE to keep your song, and the export panel to render audio.

3. Pads

3.1 Playing and selecting

• Tap = play the pad.
• Long press = select the pad (target of SAMPLE, IMPORTA, CHANNEL FX, keyboard).
• On pads 9–16, tap the ▲ area or swipe up to open the note grid; ▼ marks the pad whose grid is open.
• Each pad has its own colour; the selected pad is brighter with a thicker border.

3.2 Drum pads (1–8)

Each step is on or off. The step grid below the pads shows all 16 pads over 16 steps.

3.3 Pitched pads (9–16) and the note grid

• 16 steps × a 16-row window over a 48-row range (4 octaves).
• OTTAVA SU / GIÙ moves the window by one octave. Notes outside the window stay stored, keep playing and are included in MIDI export.
• Rows show real note names (base note + transpose); black keys are shaded.
• Polyphonic: several notes can be on the same step.
• GLIDE on/off with TIME sets portamento between notes.

4. Sequencer, patterns and song

4.1 Step sequencer

• SEQUENCER — 16 STEPS × 16 PADS. The cyan playhead shows the current step. Numbers above the grid mark groups of steps.
• Tap a cell to toggle it.

4.2 Transport

• PLAY / STOP. − / + change tempo in steps of 2 BPM.
• RANDOM BEAT generates a drum pattern for the current pattern.

4.3 Patterns (512)

• PATTERN n/512: the one you are editing. Use ◀ ▶ (±1) and −10 / +10, or tap the number to type it (VAI AL PATTERN).
• PLAYING m shows which pattern the engine is rendering.
• CLEAR Pn empties the pattern being edited.

4.4 Song chain (512 slots)

• SONG: ON/OFF switches between looping one pattern and playing the chain.
• + Pn appends the current pattern; tap a slot to increase its repeats (P3×4); long-press to remove; CLR clears the chain.

5. Sounds

5.1 Your own samples

• SAMPLE records from the microphone into the selected pad. Use headphones to avoid feedback.
• IMPORTA loads WAV, MP3, OGG or M4A. Maximum 6 seconds per pad; longer files are cut and a notice is shown.
• The waveform panel shows CAMPIONE PAD n, name and length.

5.2 SUONO (built-in instruments)

Pitched pads (9–16) can use 13 built-in instruments. They are synthesized by the app, not recorded: recognizable instrument families rather than sampled realism.

MIDI export writes a matching General MIDI program for each instrument, and importing a MIDI file picks the closest one.

5.3 PRESET screen

Open from the bottom bar. Presets appear as 3-column squares with a waveform preview. Tap to preview; IMPORTA loads the preset into the selected pad. Categories are defined in presets.json; the VIBRANIAM category is reserved for future packs.

6. Keyboard and MIDI

6.1 Floating keyboard

• Open it with the movable keyboard button; drag the button anywhere.
• Pad selector 1–16 chooses which pad you play.
• 2 octaves; OCTAVE shift.
• BEND and MOD wheels sit above the keys, on the left.
• HIDE CONTROL / SHOW CONTROL collapses the controls to leave more room.

6.2 MIDI input

Connect a USB (OTG) or Bluetooth LE MIDI device. Supported: notes, pitch-bend, CC1 (mod wheel), CC64 (sustain).

7. Sound shaping

7.1 CHANNEL FX (per pad)

Select a pad, then adjust:

7.2 FX RACK (global)

Same families of controls applied to the whole mix, plus VOL (master).

7.3 CHORD MATRIX — harmonic transpose

The 12 note names on a circle set the root (0 to +11 semitones). Interval buttons: UNI, OCT+, OCT−, 5TH, 4TH, MAJ3, MIN3, MIN6, ROOT. The hub shows the exact transposition in semitones.

7.4 MIXER — 16 channels

One fader per pad. MUTE ALL silences every channel, ALL restores them.

8. Projects and files

8.1 SAVE / LOAD

Saves and loads the whole song (patterns, song chain, sounds, settings). SAVE PRESET / LOAD PRESET store a single sound setup.

8.2 GLOBAL REC

Captures the final mix while you play. The banner ● GLOBAL REC — CAPTURING MIX blinks while active; press REC ● STOP to finish.

8.3 Export

Choose format, master or stems, and the number of bars, then export. Files go to Music/Vibraniam. MIDI can be shared directly.

8.4 Import MIDI

IMPORTA MIDI reads a .mid file into patterns. A dialog shows bars and BPM and any warnings; if the current song is unsaved you can confirm replacement.

9. Look and feel

PAL cycles four palettes: 1 original, 2 pastel, 3 white, 4 black & white.

10. Audio performance

The AUDIO OUTPUT and STRESS TEST panels show output latency, sharing mode (Exclusive/Shared), MMAP, burst/buffer and sample rate. Latency depends on the device and output: wired/USB gives best results; Bluetooth adds delay. The engine uses no memory allocation or locks in the audio callback.

11. Troubleshooting

12. Specifications

• Audio engine: native C++ on Oboe 1.8 (AAudio, low-latency, Exclusive requested), real-time safe callback
• Pads: 16 · Steps: 16 · Patterns: 512 · Song slots: 512
• Sample limit: 6 s per pad · Sample rate: 44.1 kHz float stereo
• Export: WAV, FLAC, M4A, MIDI (SMF1, 480 PPQ)
• Android 8.0+ · ABIs: arm64-v8a, armeabi-v7a, x86_64

13. Glossary

14. Links