the amp im lookin at has volume control and a master, so is a volume pedal a good idea/ necessary??
My Gear:

Fender Aerodyne Stratocaster
NOS Tweed Fender Blues Jr
Boss BD-2
Boss CE-5
Boss CS-3
Dunlop Slash Crybaby
Korg DT-10
Boss BR-600
MXR Script Phase 90
MXR DD-7 Analog Delay

GASing for:
Vox V847
I have one and I use it a lot.
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You also have a volume control on your guitar...

Epiphone Les Paul Standard w/ SD Alnico Pro II's
Fender Aerodyne Telecaster & Stratocaster
Marshall JCM 800 4104 combo

E-Married to Funny_Page
A Volume Pedal would really just be useful for raising and lowering your sound level, for let's say rhythm and lead, and it can also totally mute your tone. It's all in what your going to use it for.

Martin DSR
Taylor 214e
Fender Strat
Epiphone 335 Dot
Carlo Robelli Acoustic

1978 Fender Pro Reverb
Boss Blues Driver
Boss Super Overdrive
EHX Holy Grail
Boss DD-20 Giga Delay
depends if you use one or not. there's a volume knob on your guitar which does the same thing, but some people prefer to do that with their feet as it's easier to mess with on the fly...
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The fact that the amp has a master a gain controls should affect the need or un-need(?) for a volume pedal. You lower the amount of signal going in, and your preamp isn't going to overdrive as it would with the full signal.
I know people who swear that there volume pedal is best for swells, but I think I'm fine with just my volume knob. I do have the treble bleed mod done so that the tone is consistent through the whole spin.