However, here some further insights and clarifications for this much time-consuming project ...
... despite of compiling 17!!! single units in enormous amount of time and effort ...
... for our new WU Series AUSamper on iOS, for instance, we invested loads of additional work and provided support for Apples native ESX24 file format (*.esx) and the native AUSampler file format (*.aupreset). (The sampler, by the way, can also load single files in all supported native iOS audio formats or single patches from soundfonts (like *.dls and *.sf2) on demand, which then will be converted to native sampler format by our units for further editing and refinement.) The sampler will allow to import and manage a large library of files this way and allow to edit the generated patches. Wide patch sharing would be no problem with such an open concept. State saving is fully supported by all WU audio units with key-value serialization mechanisms, that is even compatible with the editable native sampler format (XML). This format is human-readable and very transparent and documented by us. MIDI automation support is implemented into all of the audio units in the WU Series, a function that is not supported by Apples native AudioUnits, b.t.w.
We especially concentrated to add full support for the popular MacOS generated AutoSampler patches (which are generated in Apples propietary EXS format version 2). So that users easyly can create, import and collect large libraries of professional plattform-compatible sampler files, or patches comfortably created on the Mac with the ESX24. The EXS file format is by design a closed binary file format, which is not documented at all. Therefore allot of reverse engineering, investigation and and time was needed to make it happen. Exporting of EXS files will not be supported, but the exported native *.aupreset format can be loaded with Logic, GarageBand and MainStage on the Mac using the AUSampler there, vice versa.
Users cannot expect to get such big amount of work for free.
There is not even one single available AUSampler integration on the iOS platform since it was shipped untill today. Because it's not quite easy to achieve and nearly everything is undocumented by Apple. But the sampler audio unit is there since many years now and nobody really has managed to unvail its power on the iOS system. Not even Apple themself. The GarageBand sampler seems to be just a bad joke by a voluntary project!
The fundamental problem with all Apples native sampler formats is the fact, that file references are absolute paths and thus not interchangeble without modification. The EXS file format, for instance does not allow for editing the file paths afterwards and the user cannot even freely control where the files are located. This is a massive conceptual mistake, making it quite useless on iOS. Our importer therefore ensures seemless importing, rewriting, recompiling and validation of all samples paths on the iOS platform while the import process, so that the audio units can access it from within any host application afterwards without a problem.
Although, some certain procedures must be followed while importing patches created on the MacOS. This will be exhaustly documented by us. Editing the samplers native *.aupreset format on the Mac is generally quite tricky even there, because Apples provided user interface for the AUSampler is buggy since its very first release, it can crash the entire host and is extremely uncomfortable to use on the latest systems. We also planned to provide full featured sampler format editors/creators with successive releases for iOS, which are useful on a touchscreen interface, whereby the sampler unit itself will be kept as simple as possible and optimized for the audio performance.
While the other audio units from Apple have quite average (up to questionable) quality, we think, that even the AUSampler and also the AUMIDISynthesizer b.t.w., (a fully GM compatible multi-timbre 16 channels synthesizer audio unit) would extend the possibilities with audio units on the platform fundamentally and unleash some really new ones.
A collection of MIDI enabled Audio Units, which expose user interfaces to iOS system included Audio Units and extend them.
iOS includes allot of useful Audio Units, but many host apps do not expose these to the user, never mind of not enhancing their functionality in any way. The result is often missing these essential cross-platform compatible Audio Units, the basics, i.e. the compander, expander, compressor, limiter, ring modulator, decimator, delay, reverb, filters and EQs and so on, which are all well known from the MacOS (GarageBand, MainStage and Logic Pro X).
So we created generic user interfaces, that wrap these included system Audio Units to expose all of their parameters to the host applications not providing such, because of the simple lack of missing a user interface to expose. (These system units are by default and probably intention parametric Audio Units without an UI on iOS). We also extended the functionality to enable direct MIDI controller assignment to the single parameters. Some of the wrapped units will even provide extra enhanced user interfaces for better usability.
(Note: The direct MIDI support is somewhat experimental, because it requires to hook functions, that are not directly supported by the inherited Audio Units.)
This collection concept may sound quite simple but required allot of research and work on our side and so each single unit extension will be available for the lowest possible price in the appstore, not for free. The collection is planned to be available as sorted packages too, later, because users may not need all the Audio Units at ones or even owning each single unit of them.
The complete collection includes the following 17 singe componets, which will be tested and released if ready in successive order:
Pack 1: Delays & Reverbs
- WU: AUDelay (classic delay effect)
- WU: AUSampleDelay (a sample offset)
- WU: Reverb (preset reverb)
- WU: Reverb2 (algorithmic reverb)
Pack 2: Distortion & Dynamics
- WU: AUDistortion (multi distortion effects)
- WU: DynamicsProcessor (multi dynamics effects)
- WU: AUPeakLimiter (peak/brickwall limiter)
Pack 3: EQ & Pitch
- WU: AUNewPitch (pitch shifter)
- WU: AUParametricEQ (single band EQ)
- WU: AUNBandEQ (10 band EQ)
Pack 4: Filters
- WU: AUBandpassFilter (single bandpass filter)
- WU: AULowPassFilter
- WU: AUHighPassFilter
- WU: AULowShelfFilter
- WU: AUHighShelfFilter
Pack 5: Synthesizers & Samplers (*)
- WU: AUSampler (single channel polyphonic sampler)
- WU: AUMIDISynthesizer (multitimbre/channel GM compatible synthesizer) (**)
(**) GM (General MIDI) compatibility and sound quality always depends on the used sound fonts.
This is an exclusive iOS (12+) release ( universal/audio unit ).