This article is part of the Source-Connect Pro and Pro X 3.9 User Guide

CPU speed / RAM configurations

Because USB devices (for example, if you are using an Mbox for your audio I/O) also require additional resources we recommend running Source-Connect on newer machines. If your computer is configured with insufficient resources, you may experience difficulty while reading and writing to disk, and your DAW may tell you that you have insufficient resources.

It is not recommended that you connect your audio devices via a USB hub unless the hub is self-powered. 

Eero routers will cause Source-Connect to crash when ports are not forwarded

Due to a UPnP bug, any Source-Connect installations lower than 3.9.1 will crash. To avoid any issues, install the latest 3.9.1 macOS version available in the Downloads page.

Negative values RTS send/receive delays

There is a known issue where any negative values entered in the send/receive delays will get converted to a different, large integer upon restarting Source-Connect Pro. If you run into this issue, please either configure the delay on your DAW or contact the Support team.

Network bandwidth

The most common cause of difficulty is insufficient network resources. Assuming your network has sufficient bandwidth the issue may be due to internal congestion, for example an FTP server is running or other people are heavily using the network. A common fix for this is to install a dedicated DSL line, or apply QoS (‘Quality of Service’) settings on the router. 

For further details and tools see the Support section online or contact Support.

Some networks may cause Source-Connect Pro X to crash when sending 7.1 channels at high bitrates

This is a known MTU (maximum transmission unit) bug. The AAC codec packages more data in the packet than most standard routers can manage. In order to resolve this:

1. Lower the bitrate you are using in Source-Connect Pro X. The quality will not be affected. See this article for bitrate information.
2. Request an MTU increase from your IT support.

Source-Connect Pro X 3.9 at the highest bitrate, 1344kbps

Source-Connect Pro X 3.9 has been proven to disconnect and sometimes crash when connected at the highest possible rate, since MacOS Mojave, Catalina and Big Sur.

The workaround is to connect at the 2nd lowest bitrate, 1280kbps. There is very minimal difference in sound quality.

Source-Connect 3.9 takes over the Cmd + Shift + P shortcut

When Source-Connect 3.9 is running, it takes over the Cmd + Shift + P shortcut and overrides any other running applications. If the combination is selected, it will display a round-trip latency calculator window. If you are using the shortcut in any other applications, you will need to update them and select different shortcuts.

Unsupported Pro Tools versions

The Q Manager with Auto-Restore and Replace is not available for any Pro Tools 6 version.