Soundcraft GB4 is available in frame sizes from 16 to 40 channels, designed for installations including churches and performance venues, or for small touring sound systems. The dual-mode topology implemented to such success on the MH3 and MH4 desks allows the GB4 to be used on FOH or monitor duties, with fader control of group or aux outputs. The GB4 does have some unique mechanical features, although largely conventional in layout. The rugged steel chassis has a sloping rear connector panel so that it is easier to configure from the front of the desk, while the integral power supply has a link option for an external back-up PSU. Four mute groups allow several channels to be muted at the same time, while another unique facility is the limiter on a set of dedicated record outputs that makes it easier to create a stereo recording of the mix. The console also features an output matrix