Hello, and welcome to the Soundcraft Video Manual Series. Today, we’re gonna talk about the dbx Automatic Feedback Suppression, or AFS included with all Soundcraft Ui mixers. The AFS processor will allow you to ring out your system before a gig to catch troublesome feedback, while also being flexible enough to catch and notch feedback in real time during a performance with its live filters. Let’s get started.
 There is an AFS processor available on all aux and master outputs of the Ui mixers. This means your monitors can have just as much independent feedback control as your mains. In this example, let’s set up the AFS on our mains, but the process is the same for your auxes. Start by double tapping on the bottom of the master fader to pull up the Edit section of the mains. Then click the EQ tab to access our EQ and filter section. Click the AFS setup button in the bottom left hand corner to see the AFS menu. Here you will see any fixed and live filters that have been caught. Fixed filters are filters that you get from tuning or ringing the room before your gig. Live filters are filters that you get during the performance and will come and go on their own as feedback is detected and cut out.  
Let’s start with ringing out the system for our fixed filters. When ringing out feedback, make sure that all of your mics are live, with noise gates disabled, and at performance level, or the level that they will be for the show. This should be done before your performance, but after your soundcheck. Bring your master or aux fader all the way down. If you see any filters here in the filter display, go ahead and clear them by selecting the CLEAR ALL button. Turn on the AFS by pressing the ON/OFF button next to the SETUP button, and make sure you are set to FIXED under the MODE selection. Slowly turn up your mains until you get to performance level, then push a little higher or until you start to see fixed filters catch. Once they have filled, then you’re set, and you can lower your fader back down to performance level.
 Finally, switch the mode from FIXED to LIVE. This will enable the flexible live filters. You do not need to ring out the system again, since these filters are meant to come and go on their own during the performance. You can even avoid the fixed filter setup altogether if you want by just enabling the live filter mode. We recommend leaving the sensitivity at 0dB, as it should be an ideal starting point for most applications. If you feel you are getting too much feedback or the filters are catching too quick, then adjust the sensitivity slider. Remember that the AFS is separate on all your outputs, so you should activate and repeat this process for any auxes that you might be using for feedback sensitive stage monitors also.