The Portal audio plugins allow you to magically send audio from one side of the processing chain into another. This is the source/exit/transmitter side of the Portal. They can be used as a way to parallelize the audio processing by forcely splitting a single chain into 2. Imagine the scenario of 4 plugins running in series (one after the other), where each plugin is given a letter: A -> B -> C -> D Plugin D waits for C, which waits for B which waits for A, all a single line. In audio processing each plugin runs consecutively one after the other, typically on a single CPU core. From A to D, all plugins must be able to process audio within a certain time limit, otherwise xruns occur. If one plugin in the chain is heavy, it will limit the amount of time and processing available to the others. Now imagine the scenario of 4 plugins running in parallel, using 2 series for simplicity: A -> B C -> D There are only 2 dependency chains now, B waits for A and D waits for C. This means the 2 series can run in parallel, each on its own CPU core. In the audio processing side the time spent running all plugins is now up to half of the first example. We can run as many series as there are cores in the system while keeping good performance. By splitting the processing chain in 2, the Portal audio plugins allow running the 2nd part of a chain in another CPU core. Simply load both sink and source portal plugins and connect each to the appropriate plugins. Note that only load 1 sink and 1 source can be loaded at a time. The side effect is 1 audio cycle of latency coming out of the source/exit/transmitter portal. For some effects like delay and reverb this could be a worthy compromise.