Troymissen

Hi guys, I hope someone could help me I recently brought a Atari ste and got given a E Magic LOG 3 with it. It's like a midi expander box if anyone has any info on what it's used for or if it is purely a midi expander. What sort of price do they go and is it a sort after item. I'm totally new to the st scene so if anyone has any info or knowledge please let us know. *It's not my photo used but looks exactly like that