D
A
D
To determine in advance how much gain I can add without pushing the peaks more than a few dB into the final compressor/limiter threshold on the Master, and to help spot "outliers" that should maybe be knocked down with some local attenuation somewhere upstream.

1. C
2. A
3. D
4. All the time.
 
This feature is integral part of my workflow. 

1. Do you use the waveform preview feature?
D. I use it occasionally
 
2. Do you use this on buses or instrument tracks?
A. Bus waveform preview
 
3. Waveform preview allows you to display historical peak markers on the timeline. Do you use this feature?
C. I use this feature often
 
4. When do you use this feature in your production?
The waveform preview I use occasionally, if I'm looking for multiple high-energy regions and masking/phase issues.
I have the peak markers on all the time, especially after I finished recording a track, as I'm not watching the level meters while I play.

1. Do you use the waveform preview feature?
C. I use this feature often, but with a caveat that I might not be using it to its full potential.

2. Do you use this on buses or instrument tracks?
C. Both, I think
 
3. Waveform preview allows you to display historical peak markers on the timeline. Do you use this feature?
C. I use this feature often
 
4. When do you use this feature in your production?
Whenever something doesn't sound right and I want to check where the problem might lie

1. Do you use the waveform preview feature?
A. Wasn't aware of this feature
B. Aware of it but never use it
C. I use this feature often
D. I use it occasionally
 
2. Do you use this on buses or instrument tracks?
A. Bus waveform preview
B. Instrument track waveform preview
 
3. Waveform preview allows you to display historical peak markers on the timeline. Do you use this feature?
A. Wasn't aware of this feature
B. Aware of it but never use it
C. I use this feature often
D. I use it occasionally
 
4. When do you use this feature in your production?
 I use it for applying automation mostly. Sometimes I will use it to find peaks or debug a click or pop I hear.
 

1. Do you use the waveform preview feature?
I use it often

2. Do you use this on buses or instrument tracks?
Mainly buses, occasionally softsynths
 
3. Waveform preview allows you to display historical peak markers on the timeline. Do you use this feature?
Yes
 
4. When do you use this feature in your production?
I mainly use it to check for inconsistencies in overall levels, especially on the master bus and particularly before exporting.

1. - B
2. - B
3. - B
4. Never

1. Do you use the waveform preview feature?
    C. I use this feature often

2. Do you use this on buses or instrument tracks?
    A. Bus/Master waveform preview
 
3. Waveform preview allows you to display historical peak markers on the timeline. Do you use this feature?
    D. I use it occasionally
 
4. When do you use this feature in your production?
    Checking overall levels, bus automation visuals (fade in/out), check peaks before the final export.

1. Do you use the waveform preview feature?
D. I use it occasionally
 
2. Do you use this on buses or instrument tracks?
A. Bus waveform preview
 
3. Waveform preview allows you to display historical peak markers on the timeline. Do you use this feature?
D. I use it occasionally
 
4. When do you use this feature in your production?
Most often when mastering on the main buss to see if I'm over compressing.  Looking for too many flat tops.
 

jpetersen
Nearly every audio software I know shows a preview of the waveform as it records.
Am I misunderstanding something?

Noel is not talking about the red coloured preview as you record.  This is a waveform that renders in real time on busses during playback.  You have to right-click on the bus to enable it.