Speed of Sound

Speed of Sound


Keep your eyes on the road, not your phone! Speed of Sound automatically adjusts your music player's volume while you're driving about with your GPS, lowering the volume while driving slowly or at a stoplight, and cranking it up on the highway.

Warning: This is heavy on the battery! Please use a car charger.

This is a feature available in some more expensive cars and sound systems. We're giving it to you for free to use on your phone. Just start up your music player, plug your phone into your car stereo, and open Speed of Sound.

When you're done with your drive, you can take a look at a map of what songs you listened to and where. Don't worry about tagging that one song-you-can't-remember-the-name-of, just check the map afterwards.

Features

• Customizable volume levels and speeds
• Map of songs you listened to on your drive, compatible with Google Music, HTC/Samsung music players, WinAmp, and any player that supports Last.fm scrobbling
• Smooth volume adjustment
• Smart speed filter that avoids random GPS jumps
• Options to auto-activate when plugged into headphones, charger, and Bluetooth

Disclaimer

While this app is great to use while driving, it's designed to keep your eyes on the road and not your phone/radio. So don't mess with this app or your phone at all while driving.

Feedback

This is a beta release, so expect a few minor issues. That said, we'd love to hear your feedback. Submit an issue on GitHub, or send us an email with your thoughts.

Help Translate

Want to translate Speed of Sound into another language? Check us out on Transifex:

https://www.transifex.com/projects/p/speedofsound/

FAQ

• Can I use this with my car radio?
That's what it's for -- as long as you have an aux input and a decent cable to plug into your phone and radio, you're all set. If you don't have that, this won't be of much use unless you want to listen to music on your phone's awful speaker.

• What are some recommended settings?
The defaults that come with the application have been tested in the wild and have shown to work well. That said, everyone's tastes are different. We recommend choosing a slow and fast speed that aren't too far apart, because the effect is greater than you might think. Also, many phones get really quiet below a volume of 60, so pick volumes that are not too far apart.

• This drains my battery!
Yes, yes it does. Plug your phone into a charger while you drive.

• Why does my phone seem to "jump" between volume levels?
Unfortunately, this behavior shows up on many phones. We do our best to make volume changes smooth, but a lot of phones will only change the volume in increments of 5% or so. Not a whole lot we can do here, sorry.

• Where's the source?
The code is available under the GPLv2 on GitHub: https://github.com/jpeddicord/speedofsound
Feel free to fork, file bugs, or stare in awe.

Permissions

• Position & GPS - We sorta need this to know how fast you're going.
• Bluetooth - Used to auto-activate when you connect to a Bluetooth music player.
• Internet, Accounts, Network, External storage - All for Google Maps alone.

Recent changes:
0.8.3:

* New translations: German, Greek, Dutch, Brazilian Portugese (http://goo.gl/pkxel)
* Battery life optimizations
* Added a "Stop" action to the notification (Android 4.1+)
* Allow greater speed ranges
* Improved settings controls
* Google Maps v2

New permissions (network, accounts, & external storage) are all for the new Google Maps; not used by the application itself.
Add to list
Free
83
4.2
User ratings
46
Installs
5,000+
Concerns
1
File size
491 kb
Screenshots
Screenshot of Speed of Sound Screenshot of Speed of Sound Screenshot of Speed of Sound Screenshot of Speed of Sound

About Speed of Sound
Keep your eyes on the road, not your phone! Speed of Sound automatically adjusts your music player's volume while you're driving about with your GPS, lowering the volume while driving slowly or at a stoplight, and cranking it up on the highway.

Warning: This is heavy on the battery! Please use a car charger.

This is a feature available in some more expensive cars and sound systems. We're giving it to you for free to use on your phone. Just start up your music player, plug your phone into your car stereo, and open Speed of Sound.

When you're done with your drive, you can take a look at a map of what songs you listened to and where. Don't worry about tagging that one song-you-can't-remember-the-name-of, just check the map afterwards.

Features

• Customizable volume levels and speeds
• Map of songs you listened to on your drive, compatible with Google Music, HTC/Samsung music players, WinAmp, and any player that supports Last.fm scrobbling
• Smooth volume adjustment
• Smart speed filter that avoids random GPS jumps
• Options to auto-activate when plugged into headphones, charger, and Bluetooth

Disclaimer

While this app is great to use while driving, it's designed to keep your eyes on the road and not your phone/radio. So don't mess with this app or your phone at all while driving.

Feedback

This is a beta release, so expect a few minor issues. That said, we'd love to hear your feedback. Submit an issue on GitHub, or send us an email with your thoughts.

Help Translate

Want to translate Speed of Sound into another language? Check us out on Transifex:

https://www.transifex.com/projects/p/speedofsound/

FAQ

• Can I use this with my car radio?
That's what it's for -- as long as you have an aux input and a decent cable to plug into your phone and radio, you're all set. If you don't have that, this won't be of much use unless you want to listen to music on your phone's awful speaker.

• What are some recommended settings?
The defaults that come with the application have been tested in the wild and have shown to work well. That said, everyone's tastes are different. We recommend choosing a slow and fast speed that aren't too far apart, because the effect is greater than you might think. Also, many phones get really quiet below a volume of 60, so pick volumes that are not too far apart.

• This drains my battery!
Yes, yes it does. Plug your phone into a charger while you drive.

• Why does my phone seem to "jump" between volume levels?
Unfortunately, this behavior shows up on many phones. We do our best to make volume changes smooth, but a lot of phones will only change the volume in increments of 5% or so. Not a whole lot we can do here, sorry.

• Where's the source?
The code is available under the GPLv2 on GitHub: https://github.com/jpeddicord/speedofsound
Feel free to fork, file bugs, or stare in awe.

Permissions

• Position & GPS - We sorta need this to know how fast you're going.
• Bluetooth - Used to auto-activate when you connect to a Bluetooth music player.
• Internet, Accounts, Network, External storage - All for Google Maps alone.

Recent changes:
0.8.3:

* New translations: German, Greek, Dutch, Brazilian Portugese (http://goo.gl/pkxel)
* Battery life optimizations
* Added a "Stop" action to the notification (Android 4.1+)
* Allow greater speed ranges
* Improved settings controls
* Google Maps v2

New permissions (network, accounts, & external storage) are all for the new Google Maps; not used by the application itself.

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User reviews of Speed of Sound
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Android Market Comments
A Google User
Aug 12, 2014
Promising, but won't stay on The app needs a persistent service. It disables itself anytime my phone sleeps or when it isn't in the foreground. And even sometimes when it's in the fg, screen on, and charging. I'm thinking the auto off function hasn't been fully explained? I'll be happy with a locale plug-in and a consistent user experience.
A Google User
May 9, 2014
It tries to work I travel to Sunnyvale, CA for my work so there is plenty of stop and go traffic along the way where a song doesn't need to be as loud as it was at 70mph. The problem is that this app doesn't seem to work well when it's not running in the foreground. Often I found that while it's resting on the dashboard mount that's out in the open for all satellites to reach it, I'd go to the app and see it's waiting for gps signal... and waiting.. and waiting.. Ended up uninstalling until it. I'll try again if I seen it gets updated. T-mobile HTC One, 4.3
A Google User
Mar 8, 2014
It tries to work I travel to Sunnyvale, CA for my work so there is plenty of stop and go traffic along the way where a song doesn't need to be as loud as it was at 70mph. The problem is that this app doesn't seem to work well when not in the foreground. Often I have to unlock my phone, go to the app, and I see it waiting for gps signal... Very annoying. Uninstalled it for manual control until I see an update then I'll try again. T-mobile HTC One, 4.3
A Google User
Dec 2, 2013
This is great app. Does exactly what it says. If you could specify when it activates according to the bluetooth device it is connected, it would be a 5 star app.
A Google User
Jul 22, 2013
AWESOME and makes 4 safer drive Just wish it had an auto start setting 4 when app 1st starts.