Easiest way I do mine is: CT-F9191 tape player into tape 1 in/outs.
RG-2 processor into Dolby NR in/outs or 4 channel in/outs. Push either button down.
SG-550 equalizer can be used connected to MAIN IN/PRE-OUTS or TAPE 2 in/outs.
If you use TAPE 2 for the EQ, TAPE 2 button down, and to listen to the cassette tape, DUPLICATE button down, leaving the MAIN IN/PRE-OUT jumpers in place.
The DOLBY IN/OUTS and the 4 CHANNEL IN/OUTS is like having 2 more extra tape loops. They work the same as TAPE 1 and TAPE 2.
Try this: Use your equalizer connected to the SX-1010's PRE-OUT/MAIN IN jacks. (EQ main out, to SX-1010 main in - EQ main in, to SX-1010 pre-out)
RG-2 processor connected to the SX-1010's DOLBY NR in/outs. (RG-2 main out to DOLBY NR in - RG-2 main in to DOLBY NR out)
Whatever you have selected for your source, AM, FM, PHONO, TAPE 1, TAPE 2, etc. will now be heard through the equalizer.
Also, to hear the RG-2 Processor with everything, simply push the DOLBY NR button down!