Yes champz,
Correct, Guitar>GT10>Left/mono>AMP Return.
To the GT10 setting-Setting the ouput reference level to match the connected equipment(Main Output Level) see page 65, choose the -10db co'z your going to connect the GT10 to the Guitar AMP.
-Making setting for a connected device (Output Select) see page 25. Select the LINE/PHONE. This is what i use kasi this is the only option that activate the cab and mic sim so you can use both feature. It also stated in manual same page last sentence *When using the speaker simulation, set this to LINE/PHONE.
Although you will see those cab setting menu but there is no effect when using STACK or COMBO. Just set it to LINE/PHONE to make sure.
Now go to page 98-101 and read the selection type COSM preamp and their instructions plus the custom amp setting and custom speaker setting and experiment with it.
Why I don't use STACK or COMBO kc don ko naririnig yong COSM preamp COCKED WAH so I prefer LINE/PHONE. You'll get to know that better later in the future usage and you'll thank me to pointing that out.
-Your GT10 panel black KNOB will now be your MASTER VOLUME. Experiment with TONE MODIFY or Post EQ so to not make it BOXY sound. I use resonator2 of TONE MODIFY.
To the Guitar AMP settingcheck first the AMP your going to use kung may effect loop sa likod (Send and Return) this is what i'm refering AMP Return. Usually may EFFECT LEVEL KNOB din yan. Set it it to 12 o clock or middle. Then some has +4db and -10db push botton, just set it to -10db later test kung ok o hindi set it now to +4db kung ano preference sound mo. The purpose of that push botton is for impedance matching whenever or whatever device your going to input to the AMP Return. In your case GT10 is the device so that should be normally set to -10db. Pero kung MICROPHONE that should be +4db.
The aboved instruction is for the method i'm suggesting but if the AMP your going to use walang EFFECT LOOP no way, just go direct to AMP INPUT and use the AMP PREAMP clean channel then control the TONE so as to give way to the COSM preamp character sound medyo mahirap yan. The reason as I said is your gonna STACK the COSM preamp with another PREAMP if you get what I mean. This will sound harsh and sometimes overdriven and will just invalid the true sound of your COSM preamp simulator. Para kang nag patong ng dalawang Metal zone o dalawang distortion o overdrive. Yes sometime I did some experiment using the AMP INPUT and tweak it to closer to the sound good to me but slightly difference really just using the COSM preamp, para kang may dalang maraming GUITAR AMP iba iba ang TONE mo, that's the real purpose of COSM preamp. Others like it so much their TUBE preamp kaya 4CM ang ginagamit nila at ayaw ng COSM preamp only the GT10 effects lng, sayang ang binayaran nila sa GT10. I remember also suggesting sana gumawa ang Boss ng 2 version ng GT10 one mas mura walang COSM preamp and the other version that we had para nakatipid sila.
O baka di ka na niyan bumili ng DVD ha.....
Goodluck,