1-channel FET compressor/limiter in 500-series format 

Variable Mix Control for Precise Parallel Compression 
3 Step Switched Attack Times 
3 Step Switched Release Times 
3 Step Switched High Pass Sidechain Filter. Off, 100Hz, 300Hz 
3 Step Switched Ratio 4:1, 12:1, 100:1 (all in) 
True Hardware Bypass 
Transformers Balanced Output 
20-LED Gain Reduction Meter 
Gold-plated PCB