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We used to have our silence detector set to quite a short time, and if we were mixing down any programmes with long intended near silences we mixed in a 30Hz tone at about -15dB every 5 seconds or so which is enough to hold off the silence detector. Most of our classical music mixdowns end up incorporating quite a few patches of these!
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The silence guard tone is just about audible, or can be sensed at any rate, when listening at fairly high level on high quality headphones, but otherwise goes completely unnoticed, and is preferable to a blast of pop music from our standby service!
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The alternative of course is to lower the threshold on the detector, but that we found caused problems when computer playouts or remote contributions went silent as far as programme content was concerned, but has enough very quiet background noise or occasional clicks that would stop the silence detector kicking in. A fine balancing act can be needed!
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There is another potential issue if you have a signal processor on the output with fairly 'strong' settings as it may effectively ramp up background noise to relatively high levels  during very quiet passages. 
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Alex
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On 24 February 2015 at 13:49 steve bates <stephen.bates@saintfm.org.uk> wrote:
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One thing to watch, which may or may not affect you depending upon your tech' and set up, is that the prolonged periods of quietness in some classical music can trigger any emergency broadcasts systems you have in place to counter dead air.
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Good luck
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Steve
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Stephen Bates
<br />Chairman 
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<br />SAINT FM 94.7
<br />Ormiston Rivers Academy
<br />Southminster Road
<br />Burnham-on-Crouch
<br />Essex CM0 8QB
<br />
<br />Mobile: 07970 717041
<br />Tel: 01621 787829 
<br />Web: saintfm.co.uk
<br />
<br />Saint FM is a community radio station broadcasting on 97.4 FM to the Maldon District and South East Essex under license number CR106
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<!-- <![endif] -->On 24 February 2015 at 12:10 Darren Cullum <d.cullum@tonefm.co.uk> wrote:
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<p class="MsoNormal">We are looking at introducing a Classical Music Show into our programming output and wondered if there are any pre produced shows available OR if anyone can recommend a good, knowledge presenter that may wish to add to their portfolio.</p>
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<p class="MsoNormal"><strong><span style="font-size: 12.0pt; color: red;">Please Note:</span></strong><span style="font-size: 12.0pt; color: red;"> Tone FM is a 'Not for Profit' Community Radio Station which is run by volunteers so we may not respond to your email straight away so please be patient with us. You can help support us by placing a donation <a href="http://donate.tonefm.co.uk/">HERE</a></span><span></span></p>
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<p class="MsoNormal"><span>Kind regards.</span></p>
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<p class="MsoNormal"><span>Darren Cullum</span></p>
<p class="MsoNormal"><span>Station Manager</span></p>
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<p class="MsoNormal"><span>T:  01823 284045</span></p>
<p class="MsoNormal"><span>M: 07970 521201</span></p>
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<p class="MsoNormal"><span>90/91 East Reach, Taunton, TA1 3HF</span></p>
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<p class="MsoNormal"><span>W: <a href="http://www.tonefm.co.uk/">www.tonefm.co.uk</a></span></p>
<p class="MsoNormal"><span>F: <a href="http://www.facebook.com/tonefm">www.facebook.com/tonefm</a></span></p>
<p class="MsoNormal"><span>T: <a href="http://www.twitter.com/tauntonstonefm">www.twitter.com/tauntonstonefm</a></span></p>
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<p class="MsoNormal"><strong><em><span style="font-size: 20.0pt;">Tauntons 107.8 Tone FM is on air now in Somerset’s County Town!</span></em></strong></p>
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