howdy! As it is, the main things I'd say are 1) the 921A doesn't really do much without the 921B oscillators it's meant to drive. You could use it as a controller for the other oscillators I suppose, but it feels a little unnecessary in this setup. 2) I'd put the Surges next to the 2600 oscillator. Since the other oscillator already has a vcf and vca it feels most natural to send the 2600 to Surges. 3) The 110 oscillator has that "Initial Gain" knob, but the 2600 oscillator doesn't have its own volume knob. It can be controlled by the mixer or the input gain on Surges but will send a continuous tone on its own. That 3rd point leads me to my main recommendation for you: you could really use some form of envelope. The Make Noise Maths (or Behringer Abacus to stay on brand) is a great module for this as well as learning about modular workflow in general. A basic patch as is without envelopes would be 2600 out (waveform of your choice) into Surges input, Surges output to the Behringer mixer chanel 1. 110 vca out to mixer chanel 2. 182 cv1 out to 2600 kbd cv in, gate 1 out to Surges level in and/or freq in. 182 cv2 out to 110 vco mod in with the attenuator all the way up, 182 gate out to 110 vca and/or vcf mod in. mixer out to that audio out module. A bit limited on shaping the sounds without envelopes and lfos, but can give you a good start! Happy patching!