sorry my bad to quote the timing belt, Toyota engines are coming with a chain now, Well this voice was in my 2001 Vitz (198,000) driven. Earlier the voice was low didnt take much notice, then changed the pully bearing still the voice was there.
Similarly as you installed the original one back again
The it got worse my mechainc still wanted to try and this time he told me is bar b nae hua to its definetly the timing chain. then after a month got it replaced finally the expence was around 24-28 thousand. some gears, timing chain etc were changed the car is smooth again.
it used to go like khachr ---------- kachr -------- khachr ----------- at every rotation and used to go away or wasnt audible when driving,
The other belt ur quoting to, Is the fan/AC belt? that should only cause sqeeking sounds if its teeth are worn out or it its slightly loose. you can put some (sure water) or grese to make it better.