Peavey Session 400 is a powerful and compact 200-watt RMS amplifier, designed specifically for steel guitars. It features a wide range of controls for fine-tuning your sound, including volume, presence, middle, middle shift, treble, bass, reverb, tremolo, and master sensitivity. The master sensitivity control allows you to adjust the input sensitivity of the amp, making it ideal for both live and recording situations. The middle shift control enables you to select the specific frequency range you want to cut in the midrange, giving you a wide range of tonal possibilities.