THREE RHYMING RIDDLES

1)
We're seldom looked at, though frequently used,
Often depressed, though not abused;
Side by side, with functions opposite,
We manage the daily go and stop of it.

2)
Whether forward or backward I'm read,
It matters to me not a bit;
Both ways I'm gentle and light,
And transposed I'm ever ready and fit.

3)
I have not fingers, though I do have a ring,
I command your attention when I sing;
Introducing visitors, though not by their names,
Annoying children may use me in their games.

Answers:

1. Accelerator and brake pedal 
2. TAP, PAT, APT 
3. Doorbell