I knew that Electron applications store resources in a proprietary archive file called. I changed it to my ICQ sound, restarted Slack, and asked someone to send me a message. I found all the resource files including Hummus.mp3 Under the. To investigate where resources are stored, I went to Slack installation directory /Applications/Slack.app and searched for resource files. The framework is designed to create desktop applications using web technologies which are rendered using a flavor of the Chromium browser engine, and a backend using the Node.js runtime environment. Electron is a free and open-source software framework developed and maintained by GitHub. The Slack application is built on the Electron framework. For example - let's try to locate Hummus.mp3 sound and just modify it. Let's find out where the sound files are stored on disk and just replace them manually. OK, maybe Slack doesn't allow you to change the sound to a custom one. Looks like Slack limits the user to a few predefined sounds only. Intrigued, I looked online but still could not find how to do this. I went to Slack Preference -> Notifications but could not find how to choose my own customized sound. So, I wanted to change my Slack notification sound to the classical Uh-Oh! ICQ sound.

The Longer Story: The Stages of Grief Fail #1: Denial After a bit of playing I was able to re-create the structure of Slack cache files and I got my desired ICQ sound! I also wrote a generic tool to do this for you. After a bit of research I discovered that Slack stores the sound files in multiple locations, but the most important location is a directory with cache files which have a simple yet proprietary binary structure. In essence, Slack does not allow users to customize their sound notifications as they wish but I wanted to choose my own notification sound. run python3 slack_change_sound.py sound.mp3.Change Slack’s notification sound to Hummus (we are going to edit it) Slack->Preferences->Notifications->Select Hummus.Please note that currently my script edits the Hummus notification sound but this can be easily changed if needed. Eventually I ended up developing a simple tool to customize Slack sound notifications. TL DR: This is a story of how I felt nostalgic for the old Uh-Oh! ICQ sound and ended up with a quick research on how Slack stores and uses media files. Slack-sounds: Customize your Slack sound notifications

Old icq sound mp3