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IDProjectCategoryView StatusDate SubmittedLast Update
0006373ardourbugspublic2015-06-09 01:272015-06-11 03:39
Reporterandmatand Assigned To 
PrioritynormalSeveritymajorReproducibilityalways
Status closedResolutionwon't fix 
Product Version4.0 
Summary0006373: Fader automation happens later than visually indicated
DescriptionFader automation control points seem to be not lining up with the visual indication of where they are in reference to the waveform. The actual automation performed appears to happen slightly later than the control points indicate.

Steps to reproduce:

1. Create a new project
2. Add a mono track and arm it for recording
3. Record yourself clapping
4. Show fader automation below the track
5. Enter "draw" mode
6. Zoom in and draw automation that pulls down the fader very close to (but still before) the start of the clap, judging by the visual waveform
7. Set the track's automation mode to "Play"
8. Press play
9. The beginning of the clap is still audible

I've attached a screenshot of the result of the steps above. The clap should not be audible, but when I press play, the beginning of the clap is audible.

This is new to Ardour 4.0 (in 3.x I never had this problem) so I am assuming it is a bug, and not some new default intended behavior that I am not aware of...
Additional InformationI am using the official .deb of 4.0 on Ubuntu 15.04 64-bit
TagsNo tags attached.

Activities

2015-06-09 01:27

 

01.png (80,216 bytes)   
01.png (80,216 bytes)   

2015-06-09 01:33

 

zoomed.png (75,718 bytes)   
zoomed.png (75,718 bytes)   

2015-06-09 01:34

 

working_position.png (79,547 bytes)   
working_position.png (79,547 bytes)   

andmatand

2015-06-09 01:38

reporter   ~0016774

Last edited: 2015-06-09 01:57

 I just uploaded another screenshot (working_position.png) which shows the first position (working backwards) of the automation control points (found by guess-and-check) that actually results in the clap being inaudible.

x42

2015-06-11 03:35

administrator   ~0016778

This is expected behaviour, the fader in 4.0 is 10Hz Low pass filtered. In 4.1 this will be relaxed to 25Hz.

x42

2015-06-11 03:39

administrator   ~0016779

From the git commit log: 83519faff & a3069682
    
...this fixes various fader zipper noise issues.
It voids sample accurate fader automation (the fader-gain is low-pass filtered at 10Hz). Yet for all musical purposes this makes a lot more sense than sample accuracy anyway.

Issue History

Date Modified Username Field Change
2015-06-09 01:27 andmatand New Issue
2015-06-09 01:27 andmatand File Added: 01.png
2015-06-09 01:33 andmatand File Added: zoomed.png
2015-06-09 01:34 andmatand File Added: working_position.png
2015-06-09 01:38 andmatand Note Added: 0016774
2015-06-09 01:57 andmatand Note Edited: 0016774
2015-06-11 03:35 x42 Note Added: 0016778
2015-06-11 03:35 x42 Status new => closed
2015-06-11 03:35 x42 Resolution open => won't fix
2015-06-11 03:39 x42 Note Added: 0016779