Well, this is probably the most powerful Pod device ever, the new Line6 POD X3 Pro. This rack-mountable device comes with all the features from its stage floor version, including the dual tone, that allows to mix 2 tones or apply 1 tone to each of the instruments that can be connected.

And for the main features of the Line6 POD X3 Pro 24-bit studio-quality A/D and D/A converters and 32-bit audio processor, 78 guitar and 22 bass amps, 24 guitar and 22 bass cabinets, A.I.R. II mic modeling technology, 98 effects (stompbox, module, delays, reverbs and many more) and 1/4″, XLR, USB, MIDI, S/PDIF, Variax, AES/EBU and many more connections. All the elements that can be used can be combined up to 9 effects at the same time.