Hi there, Ferd.
I know how important it is to be notified right after doing any transactions in your account to let you know you're in the right track for this.
Please know that QuickBooks Online doesn't have a sound setting when making transactions. The sound that you've heard probably came from your device or browser that triggers the beeping sound.
I recommend sending this as a feature. This way, our engineers can check on it so they may consider it.
Here's how:
1. Select the Gear Icon. Located in the upper right corner of the screen.
2. Click Feedback, then feel free to share your thought.
3. Tap Next.
I've added this resource for future reference if ever you wanted to categorize your transactions: Categorize online bank transactions in QuickBooks Online.
You can get back here in Community space if you have further questions related to QuickBooks like running reports, handling transactions and etc. I'll be more than willing to assist you.
