ipDTL Audio Settings (5)

How do I set the default sound output on a Mac?

1. Go to System Preferences…




2. Select ‘Sound’.sound



3. Choose ‘Output’ and then select the correct device from the list…


How do I set the default sound output in Windows?

1. Open up the Playback Devices window.  You can do this in many different ways.  One way is to open the Windows / Start menu and enter ‘mmsys.cpl’ or ‘Manage Audio Devices’…

2. In the ‘Playback’ tab, select the correct device and click ‘Set Default’…

3. To adjust the output level, double-click the device.  Click the ‘Levels’ tab and adjust the slider accordingly.  Some devices need setting as low as ’3′.

How do I adjust the input device level in Windows?

1. Open up the Recording Devices window. You can do this in many different ways. One way is to open the Windows / Start menu and enter ‘mmsys.cpl’ or ‘Manage Audio Devices’…

2. In the ‘Recording’ tab, double-click the appropriate device…

3. In the ‘Levels’ tab, adjust the slider down to a level where the audio does not distort.  Often this is as low as ’3′.

How do I adjust the input device level on a Mac?

1. Go to System Preferences…



2. Select ‘Sound’.



3. Choose ‘Input’ and then select the correct device from the list…

4. Adjust the slider as required.

Note: Some devices won’t allow you to adjust the level on a Mac – instead use their built-in controls.

What sample rate does ipDTL use?

ipDTL is happiest at 48000 Hz – 16 bit.

It may also work at other sample rates from 8000 up to 96000 Hz but these are not recommended.

We advise setting any recording software to 48000 Hz, 16bit to avoid any conflict with ipDTL.

ipDTL Chrome Issues (2)

Why can’t I select the microphone on Android?

ipDTL does not yet officially support Android although we are encouraging users to try it and feedback.

At present USB microphone selection isn’t possible on Chrome for Android selection of the internal microphone is problematic. To add your vote to the Chrome team’s development plan, please visit this page and click the ‘star’.

It says my version of Chrome is not 30 or higher but it is.

Firstly make sure you’re not using a ‘Dev’ or ‘Canary’ version of Chrome.

Otherwise we have known this to resolve the problem…

Chrome > Settings > (Scroll down) ‘Reset Browser Settings’.

ipDTL Free Accounts (2)

Can we have more logins for our radio station?

We give each radio station two logins for IP DTL Free – one for the studio, and one to use on location.

If you require more logins, please upgrade to one of our paid-for packages.

Can I get a free trial?

We offer monthly subscription to allow cost-effective evaluation of ipDTL. We don’t offer a free trial, sorry.

If you’re a radio station with an official e-mail address you can get a free account with basic functionality.

ipDTL General (1)

Broadcasting over the internet? That’s a bit risky isn’t it?

Traditional methods of delivery are constantly being superseded by digital IP technology and indeed many broadcast links now use such methods.  You should ensure that the internet connections you use are fast and reliable enough for live broadcasting.

ipDTL Supported Devices (3)

Can I use IP DTL on my iPhone / iPad

Not at the moment.

We’re putting all our efforts into Windows & OSX to start with as Chrome is more developed for those platforms, and it’s easier to attach a USB microphone.

Can I use IP DTL on my Android phone / tablet

We wouldn’t recommend it yet, although it’s closer to being ready than iOS.

We need to do some more testing on Android before we can confidently recommend it.  Many Android phones aren’t powerful enough to run IP DTL and we’ve yet to find an easy way to connect a decent microphone.

Does it have to be a USB microphone or interface?


Most professional microphone interfaces now use USB to connect to the computer, but most sound devices can be selected in Chrome.

A handful of devices aren’t compatible with Chrome including some that use firewire.  On certain devices only input channel 1 is routed to Chrome.

ipDTL Technical Advice (5)

Will IP DTL run on our corporate network?

We know that it works on the BBC’s corporate network which employs a proxy server so we’re quietly confident.

Unlike many IP codecs, ipDTL uses the same internet protocols as normal web surfing, so it shouldn’t have too much trouble navigating its way in and out of your network.  You just need to convince your IT bods to allow you to install Chrome.

In some extreme cases a relay server is required to intervene.  This is not supported in ipDTL Free.

Can I use IP DTL on mobile broadband?

The trouble with mobile broadband (3G, 4G etc) is that you’re sharing it with everyone around you.  There’s no way to get guaranteed bandwidth and you never know when your fast connection will drop-off / deteriorate.

Using mobile broadband for IP DTL will earn it a bad name around your station due to this unpredictable nature.  Why take the risk?  Find a wifi point, or better still a wired connection.

What is clean feed and how is it achieved?

‘Clean Feed’ or ‘Mix-minus’ refers to an output from a studio mixing desk which includes everything that the listener hears except for the equipment you are sending it to.

It’s important not to feed the contributor’s voice back to them as there will be a slight delay, but they still need to hear everything else.

Read our tutorial on this subject.

What is a relay server and what does it do?

IP DTL will try to establish a ‘peer-to-peer’ connection between your remote location and studio – that is, travelling straight across the internet with no servers in-between.

Sometimes a peer-to-peer connection can’t be achieved due to the configuration of one or both of the internet connections.  In this instance the audio data is sent via one of our relay servers in the cloud.

What ports need to be open for ipDTL to work?

ipDTL is intended to be ‘zero-configuration’. Most users won’t have to make any changes to their router or firewall for ipDTL to run smoothly.

For optimum peer-to-peer connections it’s advisable to allow outbound access on UDP ports 49152 to 65535 or as many of these as is practical.

ipDTL Troubleshooting (3)

The person at the remote end hears their own voice delayed

This will happen if you don’t send a ‘clean-feed’ from the mixing desk in the studio.

Read our tutorial on this subject.

I can’t hear the incoming audio

For incoming audio, IP DTL will use whichever sound device you have set as the default output on your computer.

Follow these instructions on a Mac.

Follow these instructions in Windows.

There is an audio routing bug in Chrome version 32. Try Chrome 33 (current beta version – Feb 2014)

It just says ‘Loading’

In Chrome’s settings (chrome://settings/content) check that has been given access to your microphone.

Otherwise, open up the Javascript Console (Tools > Javascript Console) and check for any errors – if necessary copy and paste the results into an e-mail and forward to us.