Since its introduction, guitarists and bassists for its high-quality sound, versatile functionality, and superb operability, all in an amazingly compact package, have acclaimed the Pandora series. And now, the new PX4A joins the series. The Pandora Multi-Effect Processor is designed specifically for electric-acoustic guitar. It can transform a piezo output, which has a tendency to be sterile-sounding into many warm, deep, rich and natural acoustic guitar body tones. The PX4A is a great choice not only for practicing, but also for any situation that demands a great sound, including recording and live performance. Offers up to eight effects simultaneously. Knob-based interface for quick and intuitive editing. The Phrase Trainer function offers a great way to learn by ear or to practice soloing. You can connect a CD player or another external audio source to the PX4A's Aux In jack, and use the Key Transpose function to change the pitch of the song upward or downward by as much as one octave AUX IN jack lets you play along with external CD, MD, or MP3 audio sources. The built-in Auto Chromatic Tuner also provides a Mute function for silent tuning. Semi-transparent LCD illuminates the characters in inverse video when backlit. Two-way power supply lets you use either batteries or separately sold AC adaptor.