You didn't provide your OS and price requirements. If you want paid solution and OS is Windows here are two alternatives for Audacity.
Option 1: Adobe Audition
Edit, mix, record, and restore audio.
Audition CC is a comprehensive toolset that includes multitrack,
waveform, and spectral display for creating, mixing, editing, and
restoring audio content. This powerful audio workstation is designed
to accelerate video production workflows and audio finishing — and
deliver a polished mix with pristine sound.
Adobe Audition web page
Option 2: Sound Forge
Free, high-quality solution for music and audio editing.
Start recording with a click using the redesigned recording dialog.
Select between threshold, MTC or timestamp recording via the recording
options. Record on up to 32 tracks simultaneously and in
ultra-high-resolution audio in 64-bit/192 kHz.
Includes an impressive range of editing functions for advanced
editing: convert regions to events, lock event markers, region
markers, and envelope points to events, and automatically ripple
successive events forward in time while editing.
Plug-ins from specialists such as iZotope® and zplane. SpectraLayers
Pro now seamlessly integrated for comprehensive spectral editing.
Everything you need in one fully customizable user interface.
Master your audio and video projects with effects from iZotope®.
Create DAO CD masterings to Red Book specification. Or export
multichannel files in surround AC-3 format using the included Dolby
Digital AC-3 plug-in.
More information about Sound Forge
Edit: If you need more professional software you could try Cubase.