This module is based on the Arp 1050 mix sequencer. Although this version drops the VCO and push button functions. Using the switches, it is an 8 step sequencer, two 4 step sequencers, an 8 input mixer, 8 stage sequential switch, two 4 stage sequential switches and there is also a difference rectifier giving the +ve and -ve difference between stages 1-4 and 5-8.
The assembled PCB shown was a proto-type but the sockets should all be on the same side and the LEDs are actually thru-hole. I just used smd LEDs as they are easy to remove.
It is pretty much all SOIC and 0805 components, but a pretty easy build.
PCB - US$22, 16HP panel US$30, assembled - US$220
Finished module pictures HERE