SQN Electronics SQN-4S    
Available manufacturer's documents for this product:
 - SQN 4S Mixer Overview (html) English
 - SQN 4S Mixer User Guide (html) English
 - SQN 4S IVe Mixer Overview (html) English
 - SQN 4S IVe Mixer User Guide (html) English
 - SQN SQN 4S IVe Mixer Datasheet (pdf) English
 - SQN SQN 4S IVe Mixer User Manual (pdf) English