Basslane is the original freeware classic used in countless productions to control the stereo field of lower frequencies on tracks and mixes. It's a simple, yet very handy little utility that allows you to narrow the width of the frequencies below a defined threshold. The easy-to-use interface features a range of monitoring options allowing precise finetuning while auditioning the processing at different stages.
Regain tightness in the bottom of your mix by keeping low frequencies from kick drums, bass lines and other tracks centered in the stereo field. Stereo synth patches, drum tracks mixed from multiple sources, or tracks with delay, reverb etc will often result in a "muddy" mix if the low end is too wide. Just drop Basslane on the track and tuck in the bass as much as you like.
Basslane is very useful when mastering and especially when mastering for vinyl records. It allows you to transparently center the bass to prevent excessive stereo content in the low frequencies that could otherwise be very problematic when cutting to vinyl, or loose impact when the track is played back on mono systems.
Experiment with stereo effects on tracks without worrying about losing definition and focus in the bass region. By inserting Basslane as the last effect in the chain you can stack all the wild effects you like on the track, knowing that Basslane will keep the low end under control.