Wil this cable reduce noise from my canon t3i going into my tascam dr60d?

I imagine you actually mean the opposite - Going from the Line out of the recorder into a Mic In on the camera should have it reduced - but unless the t3i has a headphone output, you cannot use this cable to get audio from the camera into the recorder, and it would probably lower it too much, actually. This would be better suited for getting audio from another device, like your TASCAM, and sending its audio to the camera. But it won't reduce noise - it's attenuating the signal level from Line to Mic, meaning you won't blow out the input and can actually turn the input down and up on the camera, rather than lowering it and making no difference on the camera like a normal cable would.

I'd like to use this to send an audio signal from my macbook pro's headphone jack into a zoom h1 (to prevent overdriving the h1) will this cable work?

Yes, this will work for that, but you should be able to set the input sensitivity on the H1 to line rather than mic.

I have a helmet mic set up for my dji osmo action and due to it's close proximity to my mouth, i experience frequent clipping. would this help?

If the cause of the clipping is due to to much current then this attenuate cable may help. Please keep in mind that this cable attenuates the signal and it must be placed so the signal travels in the direction indicated on the cable. I am not familiar with your setup so this suggestion is only a guess. It is worth the try.

Brand	Movo
Connector Type	Auxiliary
Cable Type	AUX
Compatible Devices	Camera
Recommended Uses For Product	Connecting Microphone to Camera for Audio Recording
Colour	Black
Connector Gender	Male-to-Male
Data Transfer Rate	18 Gigabits Per Second
Shape	Round
Net Quantity	1.0 Count
Item Weight	0.02 Kilograms
Specification Met	MFI
Model number	MV-RC100
Item Weight	18 g
Package Dimensions	13.89 x 10.39 x 0.99 cm; 18 g
Item model number	MV-RC100
Connectivity Technology	Auxiliary
Are batteries included?	No

Movo MV-RC100 3.5mm Male Line-in to Male Microphone Attenuator Cable for HDSLR Cameras

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