You’re most welcome, and thanks for the compliment 
Yes mono has a quite different tone from the others, not quite as versatile but personally I really like the fairly limited pallete as it often sounds very nice. If you do get a cart it is pretty simple to mod the DMG for a direct mono output, I documented the mod on the op1 forum, the mono out gives a much cleaner and louder sound than even the prosound mod. All you need is 2 wires and a mono 3.5mm socket.
Here is a pic showing the points to add your wires:
