Preferences > Audio Settings

These are settings which affect how audio sound tracks behave.

See Audio Mapping for more details.

Display the Audio menu

Un-checking the box will make the Audio menu disappear, for those who aren't interested in audio and don't want the menu cluttering up their copy of JOSM.

Display live audio trace

Checking the box will cause an orange "play head" arrow to follow the track while playing back audio, showing where you were at the time you recorded what you are hearing (assuming the sound has been synchronized to the track).

Label audio markers

Markers usually have an associated name or number. A plain marker, such as one made from a GPS waypoint, would show an X with the name alongside. Audio markers - that is, those which have sound associated with them, display a clickable icon to play the sound. This check box controls whether the name is also displayed.

Create markers from named trackpoints

When you open a GPX file any waypoints that were marked are opened in a separate marker layer. However, some GPS devices don't create waypoints, but instead just name poibnts which are part of the ordinary track. With this option checked, such points are automatically treated as if they were waypoints, that is added to a separate marker layer.

If you don't want this to happen always, you can do it on demand for particular GPX layers using the Markers From Named Points action on the conext menu for a GPX layer.

Min audio marker sample rate (seconds)

If you have not collected explicit waypoints, you can create artifical audio markers along the GPS track using the Make Sampled Audio Layer action on the conext menu for a GPX layer, which allow you to play the sound recorded at that point of your journey.

This option controls the minimum time interval between such markers. (They must also be a minimum distance apart - see below - to avoid lots being created when you slowed down or stopped during your journey). The default is 15 seconds, which is reasonable for a cyclist doing 5m/s (about 11mph or 18km/h). In a car you'd want less time - say 7 seconds in an urban environment. On foot you'd want more - say 75 seconds.

Min audio marker sample rate (metres)

Controls the minimum distance apart for sampled audio markers, as above. The default is 75m. You would only want to change this if you wanted more or less density of markers.

You will need one or two markers at specific locations to synchronize your soiund terack with. Don't increase the density to do this: use Make Audio Marker At Play Head on the context menu for the audio marker layer once you have created it by sampling.

Forward/back time (seconds)

Controls the amount by which the forward and back buttons advance or rewind the sound track when you press them. Default is 10 seconds.

Fast forward multiplier

Controls the amount by which the fast and slow forward buttons accelerate or decelerate the audio playback when you press them. Default is 1.3.

Lead-in time (seconds)

When an audio marker is played, the sound at that point tends to be immediate, so you can lose the first part of your phrase. So playback starts this number of seconds before the actual time for the marker. If, on the other hand, you find yourself not speaking for a few seconds after you place a waypoint (maybe you need to fiddle with your GPS), you can set this value negative to start playing a little after the time at the waypoint.

Voice recorder calibration

The clock on your voice recorder is not as accurate as that on the GPS receiver. As well as synchronizing the time at the start of the recording with a corresponding waypoint, you will also need to make sure the clocks stay in sync throughout the track. This option is the ratio of a duration on your voice recorder with a duration in accurate (e.g. GPS) time. So let's say over an accurate hour your voice recorder actually records for 5 seconds too long (it runs slow) you'd set this to (3600 + 5)/3600 or 1.00139, and if it runs fast, to a number a little less than 1.

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