[audacity4blind] Re: Scrubbing using the keyboard

  • From: Gary Campbell <campg2003@xxxxxxxxx>
  • To: audacity4blind@xxxxxxxxxxxxx
  • Date: Mon, 2 Mar 2020 17:10:01 -0700

Re: keys for store cursor position and cursor to stored curso.

I use these all the time and love them, especially for labeling long ranges.  Alt+s,i and Alt+s,c works great.

Gary


On 1/22/2020 9:00 PM, Andrew Downie wrote:


Hi David

Yes, I was using control-I to create a split at relevant points. Being slack, I had not assigned keys to store cursor position and cursor to stored cursor commands and therefore had not used them a great deal.  I have now done that and it is a nice option.  All of this makes my labelling demo rather outdated.  I am thinking of redoing it once specs on scrubbing are confirmed.

Re the function keys, my bad.  I have been simply updating Audacity for so long I forgot that button.

Andrew

*From:*audacity4blind-bounce@xxxxxxxxxxxxx <audacity4blind-bounce@xxxxxxxxxxxxx> *On Behalf Of *David Bailes
*Sent:* Wednesday, 22 January 2020 9:39 PM
*To:* audacity4blind@xxxxxxxxxxxxx
*Subject:* [audacity4blind] Re: Scrubbing using the keyboard

Hi Andrew,

thanks for the feedback.

Concerning the difference in balance between forwards and backwards at low speeds. I can't reproduce the effect. Maybe it's caused by slight differences in the responses of the left and right driver units in your headphones. I assume that if you reverse the audio using the reverse effect, then that also has the same effect at slow speeds.

Concerning the using of scrubbing to precisely locate the start and end of a time selection. Am I right in thinking you are using the split command (ctrl+I) at either end, and then selecting the clip? An alternative, which is what I was assuming people would use, is to make use of the store cursor position, and cursor to stored cursor commands. You can also use the left and right bracket keys during scrubbing, but I appreciate that many may find it easier to set a precise time using key up rather than key down.

Concerning the shift+f5 to f8 keys. These are only defined in the full set of default keys, and the standard set is the default. So on a fresh installation, you have to go into keyboard preferences, and set the defaults to the full set.

David.

On Tue, 21 Jan 2020 at 23:25, Andrew Downie <access_tech@xxxxxxxxxxxxxx <mailto:access_tech@xxxxxxxxxxxxxx>> wrote:

    Hi David

    I have now had a more detailed play with scrubbing. In summary, I
    love it.  I had not bothered with zooming previously, but
    control-1, control-2 and control-3 allow effective adjustment of
    scrubbing speed.  While I am primarily interested in scrubbing at
    slow speed, there are situations where high speed would be
    useful.  The following is by way of interest rather than concern. 
    when scrubbing backwards while zoomed right in on a recording done
    with a mono microphone on a stereo track, sound is stronger
    through the right channel.  When scrubbing forwards the sound
    moves to the left channel.  This does not happen at higher
    speeds.  Again, I do not regard it as a problem.

    One of my uses of scrubbing is to locate precisely points before
    and after something to be deleted.  I therefore had some initial
    concern about scrubbing cancelling selection.  The solution is to
    use clips instead of selecting.  Pleasingly, keys shift-f5 through
    shift-f8 behave the same for clips as for a selection.  As a
    bytheway, those keys were not defined in the dev version but will
    presumably be reinstated before release.

    Once again, I regard keyboard access to scrubbing as a very
    significant inclusion into Audacity.  While we had some debate
    about using arrow keys, I am more than comfortable with this
    implementation.  While different to other DAWs, I suspect most
    people will be able to adjust.

    Andrew

    *From:*audacity4blind-bounce@xxxxxxxxxxxxx
    <mailto:audacity4blind-bounce@xxxxxxxxxxxxx>
    <audacity4blind-bounce@xxxxxxxxxxxxx
    <mailto:audacity4blind-bounce@xxxxxxxxxxxxx>> *On Behalf Of *David
    Bailes
    *Sent:* Monday, 20 January 2020 8:29 PM
    *To:* audacity4blind@xxxxxxxxxxxxx
    <mailto:audacity4blind@xxxxxxxxxxxxx>
    *Subject:* [audacity4blind] Scrubbing using the keyboard

    Hi,

    there's now a version of scrubbing using the keyboard in the
    development version of Audacity, if anyone wants to have a play
    with it. Note that this is a development version, and it's not
    recommended for normal use.

    There's a zip file, available here:

    https://github.com/audacity/audacity/suites/409383387/artifacts/1220464

    The zip file contains another zip file, which contains the
    portable version of audacity. Unfortunately this double zipping
    happens with the current automatic build scheme being used.

    The details of the user interface are given below, and are similar
    to the original proposal, with one or two minor changes. For using
    scrubbing to position the cursor, you'll get the most accurate
    results on Windows using the Wasapi host.

    - There are two new commands: Scrub Backwards and Scrub Forwards.
    - These commands appear on the Transport sub menu of the Extra menu.
    - The commands have default shortcuts U and I, and are in the
    standard default set.
    - After pressing one of the two keys, playback continues until the
    key is released.
    - Playback starts from the cursor position, or the start of a time
    selection if there is one.
    - The speed of playback is determined by the zoom level. If the
    zoom level is normal, then the playback speed is one half of the
    normal playback speed. Zooming in (Ctrl + 1), halves the playback
    speed, and zooming out (Ctrl + 3) doubles the playback speed.
    There are minimum and maximum playback speeds of one sixteenth,
    and three respectively.
    - You can scrub to the end of the audio, even if there is an
    initial selection. In other words, scrubbing forwards does not
    automatically stop at the end of the selection.
    - Normally, when one of the keys is released, the position of the
    cursor is set to the time when the key was released.
    - If during the time one of the keys is pressed the left bracket
    and or right bracket keys are pressed to set the start and/or end
    of the selection, then when the scrubbing key is released, the
    change to the selection made by pressing the bracket keys is
    preserved - the position of the cursor is not set to the time when
    the key was released.

    - If you hold down one of the scrubbing keys, and then press the
    other scrubbing key before releasing the other key, then scrubbing
    continues in the opposite direction, and does not stop when the
    original key is released.

    David.

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