In FreeTrim MP3, all output formats supported have quality settings where you can configure the parameters. This setting window is viewable after you click “Settings” button.
There are basically 2 ways that the software will create WAVE files. (These settings indicate how the WAVE files are created.)
This is the most popular setting. If you are creating WAV files so that you can burn them on custom CD compilations, choose this option. It will ensure that any non-CD quality format WAV and MP3 files are converted to CD quality compatible WAV files.
CD quality format WAV files are 44,100 Hz, 16 bits, stereo.
Choose this if you want the WAV files in a specific format.
The last alternative can be used for special situations where you need all your resultant WAV files to be in a specific format. For example, you can use this if you need all your WAV files to be mono.
The sample rate is the number of sound points per second. For example, 22,050 Hz means that there will be 22,050 samples of sound data every second.
Stereo means that the resultant files will have a left and right channel. Mono means that there is only one channel.
Bits per Sample
Each sample is stored in a finite number of bits. The more bits you use, the less noise is introduced to the sound. However, the file size will also get bigger as higher bits per sample are used. The default is 16 bit. 8 bit sounds may sound noisy especially for subtle dynamic sounds.
The easiest way of choosing a level of compression for your MP3 files is to use the Preset Quality slider.
The Preset Quality slider allows you to choose from several levels of quality and resultant file sizes. As you choose higher quality, the file size goes up as well. On the other hand, lower quality presets will be smaller and easier to send over the Internet
Preset Bit rate Mode LAME
Phone 16 kbps Mono X
Shortwave 24 kbps Mono X
AM Radio 32 kbps Mono X
FM Radio 96 kbps Stereo X (J-stereo)
Voice 64 kbps Mono X
Radio 112 kbps Stereo
Tape 128 kbps Stereo
Hi-Fi 160 kbps Stereo
CD 192 kbps Stereo
Studio 256 kbps Stereo
The default is CD quality (192 kbps, Stereo).
* Note that the FM Radio bit rate is higher than the next preset quality, which is Voice. Voice is @ 64 kbps and FM Radio is @ 96 kbps. The reason that there is a discrepancy is because Voice is mono and FM Radio is stereo. If you were to divide the FM Radio bit rate in half, you would have 48 kbps per channel, which is lower than the Voice preset.
These options allow you to set the Bit Rate and quality of OGG files.
This convenient slider allows you to quickly choose from a list of various configurations.
Preset Bitrate Channels
Voice Quality 64 kbps Mono
FM Quality 96 kbps Mono
Tape Quality 128 kbps Mono
Hi-Fi Quality 160 kbps Mono
CD Quality 192 kbps Mono
Studio Quality 256 kbps Mono
Best Quality 250 kbps Mono
This allows you to set the specific bit rate, channels and either Average or Variable bit rate.
Average Bit Rate – Choose this to set the average bit rate.
Variable Bit Rate – Choose this to set the variable bit rate. Change the slider to set the quality from 1% to 100%.
Mode – Choose mono or stereo in either Average or Variable Bit Rate mode.
If you do not see a WMA tab, you may not have WMA support properly installed.
WMA is a second generation compressed audio format.
The main option on this screen is the quality format, which is chosen by moving the slider. The possible settings are:
Preset Bit rate Mode Frequency
1 16 kbps Mono 8,000 Hz
2 32 kbps Stereo 22,050 Hz
3 48 kbps Mono 44,100 Hz
4 64 kbps Stereo 44,100 Hz
5 96 kbps Stereo 44,100 Hz
6 128 kbps Stereo 44,100 Hz (default)