[Bugs] #4353 Measure UNSP: Measure needs to stop sampling/recording when playing tuning tones

[Sugar Labs Bugs]

#4353: Measure needs to stop sampling/recording when playing tuning tones
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    Reporter:  greenfeld                  |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Measure                    |        Version:  0.98.x                     
    Severity:  Major                      |       Keywords:                             
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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 XO-1.75s have a sound driver which currently cannot playback and record at
 the same time.

 Measure needs to stop sampling/recording and completely shutdown the audio
 recording interface when playing back tones to tune instruments/etc. to
 avoid locking up the activity on this platform.

 (I do not know if the XO-4 will have this initial sound driver limitation
 or not.)

 Seen in OLPC 13.1.0 os20/Measure-44.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4353>
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