The SSL 1 has 1x Mic input on an XLR connection, and 1x Line/Instrument input on a 1/4 jack connection.
By default, channel 2 is in INST mode (suitable for high impedance input sources such as guitars and basses). Use the 'LINE' switch to put channel 2 in LINE mode, for sources that operate at line level.
The SSL 1 has 1x set of L/R outputs, and 3x stereo loopback virtual inputs for podcasting, content creation and streaming.