SampQOL OS Changelog

0.1.5 1 November 2026

HIGHLIGHTS

• Track mutes per sequence, as on the MPC Live/One/X etc.
• Hold PAD BANK and push - or +: the current track moves up or down in the track order.
• Note Repeat in Pad View (Step Edit) and Track View.
• Pad View: cut notes and paste them in another place.
• Sample Select: pads that have a sample can play their own sound next to the preview (Own Sample).
• Resample Pad can also print the Pad FX (On / Off).

SEQUENCES AND TRACKS

• Track mutes per sequence, as on the MPC Live: each sequence keeps its own track mutes. A song that you export to a sequence keeps the track mutes of each part.
• Hold PAD BANK and push - or +: the current track moves one place up or down. One UNDO moves it back. This works on all screens.

STEP EDIT

• Note Repeat works in Step Edit: in the Pad View (also with Steps on) and in the Track View.
• Step Edit: cut notes and paste them in another place. Pad View: Cut (SHIFT + B1). Track View: Copy the notes, then ERASE them.

MIXER AND EFFECTS

• Ch. Mixer: Mute on a track strip and Track Mute are one mute. The strip shows Mute also when the sequence plays a recorded track mute.
• Pad FX: Fixed effects stay on when you leave the Pad FX screen, as Latch.
• SHIFT + PAD FX can open the stock Pad FX screen at once (Settings > Shortcuts). The default is Flex Beat, as stock.
• FX Select and the Insert FX list show an icon for each effect group.

KNOBS

• Sample Tail and 16 Levels Scale: the encoder changes the value of the last knob that you turned, as on the EQ page.

SAMPLE RECORD AND RESAMPLE

• Resample Pad: also prints the Pad FX that are on (Fixed or Latch). You set the Pad FX print and the Knob FX print On or Off. SHIFT + K1 sets the tail (0 to 10 seconds) when an effect is in the new sample.

LOADING AND SAVING

• Sample Select: a pad press selects the pad and previews the file at once. SHIFT + K2 "Own Sample": pads with a sample play their own sound, so you can compare files with your kit. B3 is the stock auto-preview.
• Sample Select: New Folder also works in an empty folder.
• Browsers: the FADER scrolls the list, as a scrollbar.

FIXED

• Load Kit and Load Project: two drum tracks with the same name lost notes when you saved. Each track gets its own name (for example "Drum 001-2") and keeps its notes.
• Load Kit, then UNDO: the next save could crash when two tracks had the name of the kit.
• Half Seq and Double Seq (SHIFT + PAD 2 / 3) change all drum tracks. They changed only track 1.
• Track Mute: the pad of a muted track is light red. It was off, as a pad without a track.
• Pad EQ: a kill also stops the attack of a new note. The first part of a snare or a clap went through the kill.
• MAIN VOLUME works in the Pad View and the Track View. It did nothing there, or it changed the steps.
• Step Edit keeps the cursor, the selection and the copied notes when you open a stock screen (for example Resample or the FADER menu) and go back. The Pad View opened again at step 1.
• Track View: Paste after Copy and ERASE puts the notes back in the same place. Paste did nothing there.
• Track View: Copy and Duplicate take up to 8192 notes. With more than 512 notes, they copied only a part. With more than 8192 notes, the MPC shows "Too many notes".
• The folder pages (Home Folder, Save Sample, Save Project, Export) go up to the root of the SD card, as Sample Select. They stopped in the folder MPC-Sample.
• Sample Select: a push on the selected pad on a folder does not open New Folder.
• Sample Select: Prev. Vol. does not cover a long folder name, and does not show on a folder.
• Sample Select: New Folder (B3) shows as a stock button, not as the Preview box.

KNOWN ISSUES

• Battery Monitor: the charge is an estimate from a voltage. It can stay at one value (for example 45%) and not follow the battery. The stock battery light shows the correct state.
• A stock MPC Sample does not play the track mutes in a sequence that you made with Song Export. All tracks sound there.
• "Insufficient space on drive" is about the internal storage, not the SD card. The internal storage always keeps 200 MB free. Save your projects and samples on the SD card. Keep the internal storage as stock as possible.
• Time signature (SHIFT + K2 on the SEQ screen): each change takes about 3 seconds. When you turn K2 fast, the changes add up and the MPC stops for some minutes. Do not turn off the MPC: it comes back by itself. Turn K2 one step and wait. We are working on a fix.
• When the MPC plays and you change the sequence (also in Song mode), you can hear a short gap or click. This occurs more with many tracks or effects. We are working on a fix.

0.1.4.9 31 October 2026

START-UP AND SAFETY

• With the SD card in, SampQOL OS starts by itself at start-up, without a question. Without the SD card, the MPC starts as stock 1.3.0.
• Stock with the SD card in: rename the folder "autorun" (for example to "autorun-off"), or move it off the top level of the card. See the MANUAL, Troubleshooting.

FIXED

• FULL LEVEL (SHIFT + PAD 1) works in the Pad View and the Track View: each new note from a pad has full velocity.

0.1.4.8 31 October 2026

SEQUENCES AND TRACKS

• Explode: a pad with Out Master goes to Out Track on its new track, so the track strip meters, mutes and sets its volume.

MIXER AND EFFECTS

• Mixer: B1 shows the submix that the current pad (or its track) goes to.

FIXED

• The SD card works with each card name. In 0.1.4.7 a card with a name other than "MPC" (for example "MPC SAMPLE", the name the MPC gives when it formats a card) showed "No SD card" on the folder pages, saved projects and exports on Internal, and did not keep the Settings.
• Mixer: the Ch. Mixer and Pad Mixer screens do not flicker during playback.

0.1.4.7 30 October 2026

HIGHLIGHTS

• Up to 16 drum tracks in a project.
• Step Edit: a Pad View with a step sequencer, and a Track View with one row for each track.
• Mixer: inserts on pads, tracks, 8 submixes and the master.
• Pad EQ: a 3-band kill EQ for each pad, with a live spectrum.
• Chop Mode: up to 128 slices, and Extract to pads without a new WAV.
• Record pad mutes and track mutes.
• A MIDI keyboard plays the selected pad chromatically.
• Sample Select: make a new folder on the SD card.
• An Undo counter, and Undo on SAMPLE RECORD.
• Sample Record: To Seq puts the take in the sequence, and a Looper records more passes.
• Export: a mixdown and stems of a sequence as WAV.

BUTTONS THAT WORK DIFFERENTLY

• SHIFT + SAMPLE opens the Pad View (Step Edit). Stock: Input Config.
• PAD FX opens the Mixer. Stock: Pad FX.
• Settings > Shortcuts gives back the stock screens.
• Select the track: hold PAD BANK and turn the encoder, or push SHIFT + PAD BANK + a pad (1-16).
• Chop Mode: Extract makes no new WAV. Stock: a new WAV for each chop.

START-UP AND SAFETY

• At start-up, the MPC asks "Start SampQOL OS?". B1 = Start. B3 = Cancel = stock 1.3.0.
• A start-up screen shows the logo and the version. Ready in about 17 s.
• A watchdog starts the mod again after a crash. Two crashes = stock.
• On a firmware other than 1.3.0, the MPC starts as stock.
• Crash logs go to the SD card.
• A safety net keeps the samples that stock deletes at load. If stock changed the project, the MPC asks to load or delete the recovery copy.
• The browsers do not show the "autorun" folder of the mod.
• SD Card Access works with the mod.

SETTINGS

• A new Settings screen, next to MIDI Config, with all mod options.
• Start drive for samples and for projects, CPU/RAM monitor and battery monitor.
• Home Folder: Sample Select always opens in a folder that you choose.
• Show Knob Values, screen brightness and pad brightness.
• Shortcuts: pick the screen of SHIFT + pad, SHIFT + SAMPLE and PAD FX.
• Hide the triplet grids.
• Count-In at Start: Count-In is on when the MPC starts (default). Set it to Off to start without Count-In.

KNOBS

• All knobs on the mod screens follow Parameter Takeover, as stock knobs.

SAMPLE MODE

• Pad EQ: a 3-band kill EQ for each pad, with a live spectrum.
• Sample Tail: the end of a sample fades out, so a chop does not stop abruptly.
• 16 Levels Scale: the pads play a scale, a chord or an arpeggio.
• Keys: a MIDI keyboard plays the selected pad chromatically.
• A chord on one pad (Keys, 16 Levels Scale): each tone plays with its own length.
• The SAMPLE screen shows the sequence, the track and the pad.
• Chop Mode: up to 128 slices.
• Chop Mode: Chop Type Threshold and Split make up to 64 slices.
• Chop Mode: Chop Type Regions also gives 32 and 64 regions.
• Chop Mode: Link Slices for each pad, and a question before a rechop.
• Chop Mode: an option (Settings) to snap to a zero crossing at every zoom level.
• Chop Mode: Extract a chop to a pad, without a new WAV.
• Chop Mode: when you leave Chop Mode, a Threshold or Regions chop becomes Manual. The slices stay, also on an MPC without the mod.

SAMPLE RECORD

• To Seq: the recording goes in the sequence as a note.
• Looper: record more than one pass in one loop.
• Undo and Redo work on SAMPLE RECORD. A take is one undo step.
• STOP stays on SAMPLE RECORD.
• The Input Config settings are on SAMPLE RECORD.

SEQUENCES AND TRACKS

• Up to 16 drum tracks. Each track has its own 8 banks.
• Select a track, or make a new track.
• Copy a pad to another track.
• Select a sequence from any screen. It changes at the end of the loop.
• While you hold SEQ, the pads show the sequences (green, yellow, red), also on the Flex Beat and Pad FX screens.
• The SAMPLE screen shows the next sequence until the end of the loop.
• Select grid: a 4x4 grid shows the tracks or sequences while you select. A new track shows as "+".
• Rename a sequence, with ready-made names.
• SEQ mode: only sequences with events light up.
• Mutes: record pad mutes and track mutes.
• After Explode or Delete, a track named "Track n" gets the number of its new place. Names that you gave stay.

STEP EDIT

• Pad View: pads on the rows, 1 to 8 bars.
• Pad View: the selected pad lights up brighter on the pads.
• Track View: all drum tracks on the rows, 1 to 8 bars.
• Steps: the 16 pads are 16 steps, as on a step sequencer.
• Steps: 1 bar in 1/16 by default. Zoom from 1/64 to 16 bars without a change to your Time Correct.
• Pad View and Track View show the end of the sequence.
• Select notes, then move them, and set the length and the velocity.
• Copy, Paste, Duplicate and Clear, also into another sequence.
• Track View: Automate writes a volume or filter fade in the selection.
• Explode: each pad gets its own track.
• Track View: delete a track, with its notes in all sequences.
• View Follow: the Pad View and the Track View follow the playhead or the cursor.
• Play the selection in a loop.
• Finer grids: 1/64 and 1/64T.
• Pad View: zoom the view to 1, 2, 4 or 8 bars, as in the Track View.

MIXER AND EFFECTS

• PAD FX opens the Mixer, from every mode.
• Mixer: Pad, Track, Submix (1-8) and Master, with 4 inserts each.
• Ch. Mixer and Pad Mixer: 8 strips per page with meters, Mute and Solo. Turn the encoder for more strips.
• Ch. Mixer and Pad Mixer: K2 = pan. The FADER and the encoder set the volume of the selected strip.
• Ch. Mixer and Pad Mixer: SHIFT + B1 opens the inserts of the selected strip.
• FADER menu: Track Volume (stock: Kit Volume) sets the volume of the current track, as K1 on the Ch. Mixer. REC + PLAY records it.
• Rename a pad, track or submix, and give it a colour.
• Remove or hide the fixed master effects. A hidden effect keeps working and frees its slot. On another MPC it does not play.
• Undo works in the Mixer. REC + PLAY records on/off and volume.
• Knob FX is on the master: all pads play through it.
• Color Comp. on a track or submix.
• Pad FX: Fixed holds the effect after a tap. The FADER sets the depth.
• FX Select List: show only the effects that you use.
• Effect page: LP, HP and BP Filter show a filter curve with the cutoff and a live spectrum of the sound.
• Effect page: the Limiter shows meters for input, gain reduction and output.
• Effect page: on a track or a submix, the knobs of each effect record automation.
• Kill EQ as an insert on a track, a submix or the master: the 3-band kill EQ of the pad, with the same page and live spectrum. On a track or a submix, the knobs record automation.
• Mixer: select a pad, track or submix with PAD FX and the encoder.

UNDO AND REDO

• The Undo popup shows a counter and tells what changed.

ERASING

• ERASE AUTOMATION: erase all automation of a pad at once.
• ERASE + FADER (Track Volume): erase the volume automation of the current track in this sequence.

LOADING AND SAVING

• Sample Select: Preview with its own volume. The selected pad also previews the file.
• Sample Select: make a new folder on the SD card.
• Save Sample and Save Project: choose the folder. The MPC remembers the last folder.
• Save Project asks before it replaces a project with the same name.
• Browsers: jump 10 rows, and remember your place in each folder.
• Save Project: a random name.
• New Project from a template.
• Export: a mixdown and stems of a sequence (WAV 24-bit 44.1 kHz). The file names have the project name, and the tempo if you select it.
• Resample Pad: resample one pad with its tail, also with the Knob FX.

FIXED (STOCK PROBLEMS)

• 16 Levels: hold pad 1, push pad 2, release pad 1: pad 2 stopped too.

KNOWN ISSUES

• A stock MPC Sample loads only the first drum track of a SampQOL project. Recorded pad mutes and the Track Volume do not play there.
• Without SampQOL OS, the Pad EQ and a Hidden master effect do not play, and the Kill EQ insert plays as a PEQ 2-Band, 2-Shelf (no kill).
• Without SampQOL OS, a chord on one pad in Note On mode stops at the shortest note.
• The Knob FX is global: it is on the master, and all pads play through it. You cannot select pads for the Knob FX one by one, as in stock (FX Select).