SoundSoap 2: Get Rid of that Unwanted Noise!

A few months ago my school put on a concert of student musical performances. MacBook Pro in hand, I went to the concert, set up in the audio booth, and decided to try my hand at recording some of the songs played. Unfortunately, the conditions and equipment weren't ideal, and many of the recordings had a large amount of noise.

I then set out to find a Mac application that would allow me to make an attempt at cleaning some of these tracks up. After a little bit of searching, I found a company by the name of Bias Inc., that made an application called SoundSoap which was right up my alley.

SoundSoap doesn't have a normal OS X interface. The tools for cleaning up your audio are still cleanly laid out and simple to find. Everything you need is right there in front of you; SoundSoap has no preferences pane. To get started, you can drag a sound file onto SoundSoap's dock icon, onto its window, or find it in the Finder with Command+O.

Once you have a file loaded into SoundSoap, it is very simple to begin removing noise. Pressing the play button at the bottom of the window will play your file “as-is, and changes are reflected as you change the settings. SoundSoap has 9 different settings that you can alter to try and get your file sounding as clean as possible.

The feature that really makes SoundSoap a great application is the “Learn Noise button. The “Learn Noise button lets SoundSoap automatically set the Noise Tuner and Noise Reduction knobs to what it believes will get rid of the noise in the file.

When manually finding settings for the Noise Tuner and Noise Reduction knobs, it is good to understand what is actually happening when you turn them. Now I am no sound engineer, so I think it's best if I let SoundSoap's manual do the talking here:

The Noise Tuner knob is essentially a threshold control, and is responsible for determining what is considered to be noise, and what is considered to be the desired audio signal. For example, turning the Noise Tuner knob all the way to the left (counter-clockwise), means setting a very low threshold value. With a very low threshold value, all audio content with an amplitude above this threshold is considered to be part of the desired audio signal that we wish to preserve. On the other hand, setting a higher threshold value with the Noise Tuner means that any of the audio content with an amplitude lower than the threshold level will be eliminated.

There is a little more explanation of the Noise Tuner in SoundSoap's manual, but this is all you really need to know to get started.

The Noise Reduction knob does exactly what you'd think it would do. Turning it to the right increases the amount of noise reduction being applied, and vice versa. It's important to first find a comfortable setting with the Noise Tuner first, before setting the Noise Reduction. According to the manual though, if you use the Learn Noise feature, it usually isn't necessary to alter the Noise Reduction setting.

The little window at the top of SoundSoap's window isn't a setting, but rather a helpful indicator. It is referred to as the “Wash Window, and gives you a visual representation of how the noise reduction process is going. Blue lines represent the audio you want, and red lines represent the noise you are trying to get rid of. The line in the center of the window is the point at which noise reduction is applied. The darker the red or blue line once it has passed the line in the middle of the window, the stronger the representation.

The click and crackle slider controls the click and crackle thresholds simultaneously. Moving the slider upward removes more and more crackles and clicks. As a general rule, you want to use the lowest possible setting you can manage on this slider to get rid of the noise.

The last slider on SoundSoap's interface is the Enhance slider. Basically, this slider enhances frequencies and tone of degraded media. It is best to leave this slider until you have finished setting all other sliders and knobs. Just like the Click and Crackle slider, the Enhance slider works independent of other controls.

The next few controls in SoundSoap are buttons rather than sliders. The Preserve Voice button filters out any frequencies that are outside the range of human voice. Remove Rumble targets very low frequencies (around 40Hz) which is commonly found in recordings of vinyl records, where the very low frequency noise of the turntable motor can be transferred through the turntable's needle.

Finally, there are two settings with radio buttons: Broadband and Remove Hum. Broadband lets you choose whether broadband noise reduction is on or in “Noise Only mode. When you have “on selected, SoundSoap will process your file according to current broadband tool settings. When you are in “Noise Only mode, SoundSoap only outputs the noise you are trying to reduce, which can be a useful setting to see how effective a setting is in reducing the noise. The louder the noise is in this mode, the more drastic the change you will hear when you go back to “on or “off. With Remove Hum, you can set hum removal to either “50 Hz, “60Hz, or “off.

Once you are happy with how your file sounds, clicking “apply will apply your settings to your whole file. Then, you just have to click “File>Save As… to save your document. When saving you can choose your format (MPEG 4, AIFF, WAVE, SDII) and other settings displayed in the screenshot below.

In the end, I was quite pleased with the results that SoundSoap produced. After only a few minutes of tweaking, almost all of the noise that was affecting my files was gone once I ran the file through SoundSoap. SoundSoap also can remove noise from video files, it is not just limited to audio.

SoundSoap is also more than just a stand-alone application. It is also a plug-in for most AU, RTAS/AS, and VST host applications on Mac OS X or WinXP (including GarageBand, BIAS Peak, Apple Logic, MOTU Digital Performer, Digidesign’s Pro Tools, and more). For more serious audiophiles, Peak Pro includes SoundSoap LE (same as SoundSoap, excluding additional host compatibility) and can be an ideal tool for stereo recording, editing, cleaning, mastering, and delivery.

SoundSoap 2 retails for $129 from Bias Inc., though is available through some resellers for $99. $129 (or $99) may seem expensive for an application, but to get something like this done professionally could potentially cost much more.

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