Overview
Osiris is a 12HP wavetable oscillator from Modbap Modular, which Modbap calls Bi-Fidelity: it runs at 96 kHz with a fidelity control. Alongside the main oscillator there’s a sub oscillator with its own output and mix control, timbre modes, FM, quantize and sync, and a built-in VCA with a decay control, so it can make plucks or drones without other modules.
Its wavetables live in four banks, A to D, chosen with the Bank / Shift button. Each bank is 32 wavetable files of 32 waves, which gives 1,024 waves per bank laid out as a 32 × 32 grid. The Wave X and Wave Y knobs and CV inputs move a playhead around that grid. The factory set, called a WavPak, is built into the module and lights the bank LEDs white. User WavPaks on the card light them blue, and holding Bank / Shift switches between the two.
The factory WavPak has a different sound designer behind each bank: Ess Mattisson on A, Sonic Xpansion on B, Bogdan Raczynski on C and Beatppl on D. Modbap offers more WavPaks for download, and when Osiris finds one on the card it uses it in place of the factory set.
Wavetables on the Osiris
Each wave is 256 samples, according to Modbap’s OSIRISedit manual, and files are 16-bit, 44.1 kHz. The card must be FAT32. User WavPaks go in a folder named OSIRIS in the root of the card, with four subfolders named A, B, C and D. Each subfolder holds 32 files whose names end in _1.wav to _32.wav. Modbap suggests putting the bank and pack name in front, as in Osiris_A_SignaturePak1_1.wav, since the same numbers repeat in every bank. Other WavPaks can sit elsewhere on the card as backups and be copied into place when you want them.
Modbap’s own editor, OSIRISedit, is a Mac app based on WaveEdit. You build 32-wave tables in it, save up to 128 of them, then its Convert function writes them into that folder structure, ready to copy to the card.
WaveStack doesn’t have an Osiris target yet. It’s on the roadmap, and it needs something the current targets don’t do: a bank-and-slot folder export that writes 128 files into four folders and numbers them. The shape itself suits WaveStack well, since a 32 × 32 bank is a grid of 1,024 frames, the kind of 2D table WaveStack builds.
Until then you can make the files by hand. Export a 32-frame table with the Other tools target set to 256 samples per frame, 16-bit and 44.1 kHz, then name it with the right number and copy it into the right bank folder. That matches the format in Modbap’s manuals, but we haven’t tested it on the module, and doing a whole bank this way means 32 exports.
Specifications
| Samples per wave | 256 |
|---|---|
| Waves per file | 32 |
| Files per bank | 32 (1,024 waves per bank) |
| Banks | 4 (A–D) |
| Format | 16-bit, 44.1 kHz WAV |
| Card layout | OSIRIS/A/ to OSIRIS/D/ in the card root |
| File names | Ending in _1.wav to _32.wav |
| Card | microSD, FAT32 |
| Width | 12HP |
Frequently asked questions
How do I put my own wavetables on Osiris?
Format a microSD card as FAT32 and make a folder called OSIRIS in its root, with subfolders A, B, C and D. Each subfolder takes 32 WAV files numbered with the endings _1.wav to _32.wav, each holding 32 waves. When Osiris finds WavPaks there, it uses them, and holding Bank / Shift switches between the factory and card banks. Modbap’s OSIRISedit app builds this layout for you with its Convert function.
Does WaveStack export Osiris WavPaks?
Not yet. An Osiris target is planned, but it needs a folder export that writes four banks of 32 numbered files, which WaveStack can’t do today. In the meantime the Other tools target can write single files in the right format (256-sample frames, 16-bit, 44.1 kHz, 32 frames per file), which you then name and place yourself. That route is untested on the module, so keep a copy of the card before you try it.
Is OSIRISedit available for Windows?
Modbap’s Osiris manual describes OSIRISedit as a Mac app for macOS 10.15 or later, based on the open-source WaveEdit. It doesn’t mention a Windows version. On Windows you’d need another editor that writes 32-wave files of 256-sample frames at 16-bit and 44.1 kHz, and then arrange and name the files following the folder rules in the manual. WaveStack runs on Windows, and its Other tools target can write files in that format.
Can I keep several WavPaks on one card?
Yes. Osiris only plays the WavPak in the OSIRIS folder, but Modbap recommends keeping other packs on the same card in separate backup folders, each with its own A to D subfolders. To switch, copy the pack you want into the OSIRIS folder on a computer. Modbap also advises keeping a backup of the whole card, since the active pack is just files in folders and easy to overwrite.