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 0.6.1

- SynthJacker now supports the selection of audio input(s) for external audio interfaces with more than one channel. If the audio interface has an even number of channels, they are grouped into stereo pairs. Single channels may be selected individually. Recordings from an external source are stereo or mono depending on your input selection.
- Internal recordings from instrument Audio Units are always stereo 44.1 kHz.
- The SFZ file generated by SynthJacker now contains velocity information for the sample regions.
- SynthJacker now generates a standard MIDI file of the selected sequence as a side product of the recording.
- Some instrument Audio Units showed a blank view. This has been fixed.
- The virtual keyboard no longer obscures the instrument view.
- You can create a copy of any sequence by swiping to the left in the master list and tapping Duplicate.

Ratings and Reviews

4.7 out of 5
6 Ratings

6 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.

svan11 ,

Sampling made easy

I used to sample the hard, tedious way until I found out about this. It is perfect for creating your own Obsidian Patches in NanoStudio 2. Extremely useful and easy to use.

Dcripp ,

Where is the developer? Need manual and more tutorials.

Website says a new server is coming, that was in April! Where is the PDF manual? Seems like all communication stopped, once the app was released?

This is a pretty cool app that I see could save time when sampling synths, etc. But just putting files into a folder isn’t enough for me to use this effectively. I would like to know HOW to import these into various samplers (like Nano Studio, Cubasis, Chameleon, etc.) and advice on making velocity layers, etc?

The average musician will probably share some of my frustration and confusion on exactly how to get the most from this app without some help.

Will update my review if anything changes.

Developer Response ,

Thanks for your feedback! Please check out the Audiobus and Nanostudio (Blip Interactive) web forums, there are lots of hints and tips for using SynthJacker. Also, check out our YouTube channel for some quick tutorial videos. The user manual will be updated and restored soon.


Conifer Productions Oy
20.6 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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