Good news for FM-1 owners! I decided to experiment and connected the synth directly to the console via USB, and it turns out GrainBrick can record audio straight from the synth!

This suggests that most USB audio devices and audio interfaces should also be compatible with GrainBrick. 🥳

Are you ready? 👉

Anbernic 🛠

🛠 GrainBrick FAQ - Common Issues and How to Fix Them

We've put together a list of the most common problems users encounter when installing or using GrainBrick, along with possible solutions.

1. GrainBrick won't launch - black screen or returns to the KNULLI menu

🔹 The most common mistake is placing the application files in the wrong directory.

Both the GrainBrick application folder and the ".sh" launcher file must be placed directly inside the "ports" directory.

Correct:

ports/
├── grainbrick beta 1.0.1/
└── GrainBrick beta 1.0.1.sh

Incorrect:

ports/
└── grainbrick.beta.1.0.1/
├── grainbrick beta 1.0.1/
└── GrainBrick beta 1.0.1.sh

Remove the extra folder level. Do not rename the application files or folders.

2. Buttons are mapped incorrectly or don't work as expected

🔹 Make sure you're using GrainBrick 1.0.1.

This version fixes button mapping issues on KNULLI Scarab.

If you've manually changed the button mappings, try resetting them to their default settings.

3. The application launches, but there's no sound

🔹 Check the physical MUTE switch on your console. For example, on the TrimUI Brick, it's located on the right side of the device.

Also, check the selected audio output in GrainBrick's settings. If you're using USB headphones or an audio interface, make sure the correct output device is selected.

4. Audio dropouts, crackling, or glitches

🔹 Possible causes include high CPU usage or compatibility issues with certain USB audio devices.

Try the following:

- Reduce the number of active effects.
- Test audio playback through the console's built-in audio output.
- Connect your console to a charger while using a USB audio device.
- If your USB device supports external power, try powering it separately.

The external power suggestion is still experimental. We're continuing to investigate these issues.

5. GrainBrick doesn't work on my console

🔹 GrainBrick is currently being developed and tested primarily for devices running KNULLI firmware.

It has been confirmed to work on the original TrimUI Brick, Anbernic RG40XXV, and several other devices.

However, running KNULLI doesn't automatically guarantee compatibility. It also depends on the processor, system architecture, and available libraries.

Compatibility with other firmware is not guaranteed at this time.

6. USB audio recording doesn't work properly

🔹 Some users have reported that the incoming audio waveform is displayed correctly, but the recorded sample doesn't appear after stopping the recording.

We're still investigating this issue, and it may depend on the specific USB device being used.

If you experience this problem, please let us know your audio device model, console model, and GrainBrick version.

7. Still having problems?

Please provide the following information:

- Your console model.
- Your KNULLI firmware version.
- Your GrainBrick version.
- A description of what happens when launching or using the application.
- If possible, a screenshot, video, or error log.

The more information you provide, the easier it is to identify the cause.

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🚀 What's Next for GrainBrick?

GrainBrick development is not slowing down!

I'm currently working on a major update that will introduce many of the features you've been requesting most frequently.

Alongside these new features, I'm continuing to optimize performance, improve the interface, fix bugs, and expand compatibility with more handheld devices.

Your feedback, suggestions, and bug reports genuinely help shape the future of GrainBrick. I read your comments and do my best to take your ideas into account during development.

GrainBrick is still in beta, and there's a lot more to come!

Thank you to everyone who's trying out the app, sharing their experiences, and supporting the project! ❤️

New RHYTHM Mode!🛠

I'm working on a major GrainBrick update, and one of the biggest new features is RHYTHM.

It's a system for rhythmically moving the granular playback position between virtual regions of a sample.

You can divide any loaded sample into 4–32 regions, select the ones you want, and create rhythmic patterns without manually slicing the audio. The granular engine moves between these regions in sync with the tempo while continuing to process the sound.

The mode features 6 playback algorithms, independent reverse playback for selected regions, automatic transient-based region detection, rhythm controls, and MIDI Clock synchronization.

The idea is to create rhythms not from pre-arranged sounds, but directly from the audio material itself, experimenting with granular synthesis and effects.

The mode is already running on TrimUI Brick, and I'm currently testing and refining it!

A refreshed interface, LIVE mode, RHYTHM mode, MIDI Clock support, a redesigned FX section, color themes, and tons of bug fixes - all coming in the next major GrainBrick update! ⬆️

🛠GrainBrick - Audio Recording Issue. Let's Figure This Out Together!

I'm aware that some GrainBrick users are experiencing problems when recording audio, especially through USB audio devices such as the M-VAVE FM-1.

What's happening?

During recording, the app receives an audio signal, the waveform appears on the screen, and everything seems to be working normally. However, after stopping the recording and entering the audio editor, the waveform disappears, there's no sound, and the audio file isn't saved.

The strangest part is that this issue doesn't affect everyone.

Users with identical console models, the same KNULLI and GrainBrick versions, and even the same USB audio devices are getting completely different results:

- For some users, recording works perfectly.
- For others, audio files aren't saved at all, and the issue happens consistently.

I've tried multiple times to reproduce this problem on my own device, but recording always works correctly for me. This makes it difficult to identify the cause and develop a proper fix.

What could be causing this?

I'm currently considering several possibilities: microSD card or file system issues, errors during audio file saving, differences in device configurations, or unexpected problems when finalizing a recording.

However, these are just theories at this point.

I need your help!

If you've experienced this issue, please let me know in the comments:

1. Which console are you using?
2. Which versions of KNULLI and GrainBrick do you have installed?
3. What device are you using to record audio?
4. What microSD card are you using (brand, capacity, and speed class)?
5. Can you successfully save recordings using the console's built-in microphone?
6. Does the issue happen every time or only occasionally?

If you have the opportunity to test with a different microSD card, those results would also be very helpful.

Let's work together to figure out what's going on!

I want GrainBrick to work reliably across different devices, but first we need to identify what's causing this issue.

Thank you to everyone who's testing the app and reporting problems. Your feedback really helps make GrainBrick better!