SynthJacker is an autosampler for iOS. It automatically plays back a MIDI sequence with the notes and velocities you specify, and records the results into an audio file. It then slices the audio into individual sample files, ready to import into an iOS sampler app of your choice.

SynthJacker supports both internal instrument Audio Units (AUv3) and external hardware synths. You can also save presets of your sampling sessions, including the note range, velocity layers, and note durations. You can also apply post-processing to samples, to trim silence from them or normalize their level.

SynthJacker automatically names the resulting sample files with note and velocity information, so that they can easily be automapped by a sampler app. It also writes an SFZ file with sample information as regions and their root keys. You will find the results in the iOS Files app, in the SynthJacker folder.

What’s New

Version 0.5.4

New output settings:
- You can now select the file format of the exported note slices from AIFF, WAVE or CAF.
- There is an option to retain the original recording in CAF format if you want to do your own slicing.

Bug fixes and improvements:
- Exported files no longer have the wrong file extension.
- Recordings on a USB audio interface with multiple inputs no longer have spurious extra channels, so post-processing does not crash anymore.
- Regions in the exported SFZ file are now in the correct format.
- Some instrument Audio Unit views were not shown correctly.

Ratings and Reviews

5.0 out of 5
4 Ratings

4 Ratings

Mcdtracy ,

Auto-Sample in IOS! Finally!

Solid improvements to make this so useful to feed AudioLayer, NS2 and more. I pick any AU app and have a clone of a preset in minutes in Audiolayer using the Name-Velocity-Note naming scheme (not SFZ).

Up to 5 second samples with 5 Layers are good for me to simulate the Pianos, flutes, strings, etc. I ran 9 Audiolayers using these instruments and could never have run 9 of the original Apps without crashing my DAW.

There’s some cool updates with Noise Floor, Normalize and I expect more to be coming as the developer finds potential users to capture.

I also used my Presonus audio interface to loop back the MIDI and audio and make sample sets of IAA Apps and an external Casio Synth too.

It’s great to do this without needing a Mac or PC. IOS comes into the make your own samples age. Too cool for words and priced to return a lot to the buyer.

Chinchilla Wafers ,

Works like it says

Great utility app. Good accessory to virsyn AudioLayer. With the default file naming option I am able to record and import batches of samples into AudioLayer, and the auto map by file name gets the root note correct. Pretty handy.


Conifer Productions Oy
20.2 MB

Requires iOS 11.4 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2019 Conifer Productions Oy


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