openDSP-4x4

6 Downloads 14 Views v0.2 1.61 MB 4.1+

Download APK

(1.61 MB)

Editor's Overview

openDSP-4x4 is a connectivity application developed by Ian Williams, packaged as a single Android APK of version 0.2 weighing in at 1.61 MB. The package targets Android 4.1+ and above. Below you'll find the publisher's own description, a quick spec sheet, and a short buyer-beware checklist so you know exactly what you're installing before tapping download.

Install Checklist

Only download through the button on this page — never from third-party mirrors or shortened links, which are the most common way malware spreads.
File size is a light 1.61 MB, so it installs quickly even on modest connections.
This build is signed by "Ian Williams" — always verify the developer name matches what's listed on the app's official store page before installing an update.
After install, Android may prompt you to allow "Install from unknown sources" — approve only this one install, then revoke the permission in Settings > Apps > Special access.
We link directly to the APK file or the publisher's repository; we do not modify the binary. Always run a virus scan after any sideloaded install.

About this app

openDSP-4x4 is an open-source control app for the t.racks DSP 4x4 Mini Pro, a 4-in / 4-out XLR digital signal processor that otherwise ships with Windows-only editor software. It lets you set the DSP up from an Android phone or tablet — at the desk or on stage — connected over USB-OTG.

The control protocol was reverse-engineered clean-room, purely by observing the device's USB-HID traffic and probing it (write a known value, read it back, match the bytes). The same protocol drives a zero-install desktop web app (WebHID) and this Android build. On Android the UI runs in a WebView and reaches the device through a small native USB-host layer, because no Android browser can talk to a HID device.

Features:

* Input/output routing matrix.
* Gain, mute and polarity per channel.
* 7-band parametric EQ with high- and low-pass crossovers.
* Compressor, gate and output delay.
* Preset recall and store (7 device slots) as quick launch pads.
* Live input/output meters and full device-state read-back on connect.

Privacy:

* No analytics, no telemetry, no network connections — the app talks only to the DSP over USB.

Plug the DSP into the phone with a data-capable USB-OTG cable, tap Connect, grant the USB permission, and the app reads the device's current state and is ready to edit.

Independent, clean-room interoperability project. "the t.racks" is a trademark of Thomann; this app is not affiliated with or endorsed by Thomann.

Details

Version	v0.2
Size	1.61 MB
Developer	Ian Williams
Category	Connectivity
Package	net.opendsp.x4x4
Android	4.1+
Last Updated	Oct 29, 2026
Downloads	6

Frequently Asked Questions

Is openDSP-4x4 free to download?
Yes. The APK file linked from this page is free. The developer may offer in-app purchases once installed, but obtaining the installer itself costs nothing.

What Android version does openDSP-4x4 require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is openDSP-4x4 safe to install?
We link to the exact APK published by Ian Williams. We do not modify the file. Still, as with any sideloaded app, scan it with a reputable antivirus before opening it, and only grant permissions the app genuinely needs.

How do I update openDSP-4x4?
Install the newer version on top of the old one — Android will keep your data. If the signature differs, uninstall first (you may lose local progress).

Why is the app not installing?
Common causes: not enough storage, an older Android version than 4.1+, or a conflicting build already installed. Free up space, check your OS version, and uninstall any previous copy before retrying.

How to Download & Install openDSP-4x4

Tap the Download APK button above and save the file to your device.
Open your device Settings → Security (or Apps → Special access → Install unknown apps) and allow your file manager or browser to install unknown apps for this one file only.
Open the downloaded net.opendsp.x4x4.apk file from your Downloads folder.
Tap Install and wait for Android to finish.
Open «openDSP-4x4» by Ian Williams and grant only the permissions it actually needs.
Revoke the "unknown sources" permission once you are done installing.

Note: this page hosts or links to the installer only. The application name, icon and description are provided for identification. All trademarks belong to their respective owners.