Yes; however, in some instances, doing so can result in phasing problems caused by the characteristics of the instruments being used. If you need to connect more than one instrument (second bass guitar, drum machine, etc.), there are several ways to do so. These include:
|Connecting your main instrument to the instrument input of your choice, then connecting the second instrument to the "Effects Return" jack on the rear panel of the amplifier. This will bypass most preamp features and send the signal from your second instrument directly to the power amplifier section. Adjust the "Effects Blend" control to your liking.
|Using a two in/one out A/B box. Connect each instrument to the inputs on the A/B box and the output to the instrument input of your choice.
|Using the Raven Labs MDB-1, a product designed specifically for this purpose that allows you to connect and mix up to three instruments at once. Information on the Raven Labs MDB-1 can be found at http://www.raven-labs.com (Important note: Raven Labs is no longer in business as of Feb. 1, 2005, and will no longer be manufacturing new MDB-1 units.)