How do you lower the master volume on a sound value gp40 using an mrc tech6?

The side cab window fell inside the shell of my gp7. I removed the shell to get it out and there is an enclosure built around the cab window inside the window how do i get the window out of the cab?
Thank you

I have an ez command dcc controller  .The sound and lights on my sound value gp7 works but the engine will not move.
What could be the problem?
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How well did the earlier Bachmann gp30s run these came with the earlier horn hook couplers?
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Mark

Im looking for a Reading gp7/9 shell to swap out my BM blue shell .I have checked the bachman parts department  and they do not have a reading one anyone know where i could find one? I have checked ebay no luck
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Would an athearn blue box gp7 shell fit the Bachmann sound value gp7 chasis?
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How do you get the cab window glass out of the shell of an ho scale gp30
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Ok thank you removed the truck frames without breaking them.

I have a gp30 dcc on board that i need to remove the truck side frame from the wheels.

I have 2 sound value engines that i run on DC they run and sound great but after about a week they stall after I clean the track they are back to running great again. Are they more sensitive to dirty track then dc engines?
Thank you

Ugh its not dcc its Model: 44211
My mistake.

No its not dcc its the smaller version of the ez command dcc

My layout is DC only using 2 selector switches to control 8 blocks
I have 2 basic ez command controllers. I just added the second selector switch and 4 more blocks.  When the engines is in one of the new blocks it crawls at top speed. Is it time to get a new power pack? The original blocks work fine just the 4 new blocks are having issues.  The new blocks are 4 new sidings.
Ok the power drops when i turn on a block with the second (newer) selector switch and that is system wide. The new blocks have both rails gapped with the right side rails as common  the wires are solder to a common rail in an older block  (no bus )
Thank you

Will a gp30 shell fit the chasis/frame of a sound value gp7?
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Hi i have a dc ez command can this be used with an atlas selector for block control?