Forgive this very basic question, but this is new to me...

I have only ever printed B&W with an old B & J enlarger- consisted of a lightbulb and a piece of frosted glass- worked OK...

I recently upgraded to a Besler 45 MX (black, with the "arm" for horizontal) which has a condenser lens(es) setup and a light ontop, it's OK ...but the condenser effect seems to be a little intense for some of my older negs...

However, to get to the point, the enlarger ALSO came with a grey metal unit marked only "Beseler" and "Agfa" on the front. It has 3 analog dials, 0-99, red, yellow and blue, and some white protrustions which seem to serve no purpose. The light appears to eminate from a transluent square of material on the bottom, no condensers, but it does have a bellows attached-

How is this used, with the condensers or without? Is it good for black and white? Better than the other head? Is this particular model outdated or otherwise incomplete? Is it capable of reproducing the effects of my Ilford VC filters?

I would like to use this unit if anyone can tell me anything about it, much appreciated...

Matt