There is a horrible echo whenever i try to record and then there's a loud noice that sounds like a very high-pitched whistle and i don't know what to do.

Believe it or not this is quite common on older cars.

Newer cars have systems in place to pressurise the tank as and when needed and release pressure when needed etc, however, older cars don’t have this luxury.

However, if your smelling fuel along with it, I would highly recommend you replace the fuel cap itself, as this should have a rubber seal round it and it sounds like it may have perished. This could also explain the louder thank usual whistle.


Kind regards, R

check for debris in the air intake. I've had leaves in mine make a similar noise

hissing vacuum leak at idle, louder with open throttle ...

? 1:43
https://www.youtube.com/watch?v=tFoybr865n4
Jun 27, 2010 - Uploaded by fenixus
hissing vacuum leak at idle, louder with open throttle ... i know that my camera is poor and microphone suppresses high pitch ...Hi, my kia picanto engine also sound hissing/humming duringidling with open throttle. ... Loud whistling noise 2000 jeep wrangler 4.0l - Duration: 4:01. by Nasrac72 16,158 views.Missing: vt750c

A Whistle or metal sound with firing... - Honda Shadow Forums ...

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Jul 11, 2008 - ... under load (accelerating), that there is a small whistle or even 'tap on metal' high pitch sound ... Pics of my 2008 Shadow Aero 750 (VT750C ... loose bolt vibrating
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High pitch whine
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I know i have the same problem, and i also noticed than when i open the Hood the whistle just stops, so i figure out it must be some air cycling in or out osmewhere, I found out my air intake connected to throttle body was misplaced a weird gap was left open allowing air to whistle. u might wanna check there

Sounds like bearing squeal,providing no leaks or shake leave meantime

It may be your brake vacuum assisted booster is leaking. Have it checked out.

Audacity

It sounds like the high voltage circuit got damp and arced. This arc caused the horizontal output transistor to short.
You might try replacing the output transistor if you're experienced in this type of repair. If not then you need to take it to a repair shop.
The "whistle " you're hearing is the power supply indicating that it has a short on its load. When the power supply has an over load (short) its frequency drops down when your ear can hear it oscillating. This type of power supply is a switching power supply normally operating a several thousand hz(cycles) which is out of range of human hearing.

Stargazer

I think maybe the G-board needs to be replaced. A TV shop will have to repair it. They normally start around $200.00

I wonder if there is enough air circulating around your equipment?? My DVD recorder makes a sound unless I open the doors on the cabinet that contains all of my equipment. The cable company says it is a fan to cool down the units.