SoundWheel
Modern sound systems for PCs usually offer you a way to control the sound level. $500+ systems that shine on shelves in computer shops are sometimes equipped with a remote control. Less expensive systems may have a wheel which is completely useless if located on a speaker or subwoofer you cannot... Sound Wheel is a sound control that you always carry in your hand when working with your computer. ... Sound Wheel brings a new level of usability into the control of the sound volume. ... This is how it works: Sound Wheel replaces the standard sound volume icon in your Windows tray.
http://www.soundwheel.com/download/SoundWheel_Setup.exe - 496Kb - Download - Screenshot

Sound Snooper
Sound Snooper can be used for conference recordings, phone calls monitoring and recording, radio broadcasts logging, spying, employee monitoring, etc. Key features of SoundSnooper are: (1) Multiple sound card support. Sound Snooper supports recording from multiple sound cards simultaneously. ... (4) Automated Gain Control for perfect sound guality. ... Sound Snooper uses very little system resources while recording and even less when it's in standby mode. ... (5) All possible sound formats are supported.
http://www.modemspy.com/ftp/snooper.exe - 203Kb - Download - Screenshot

Sound Volume Hotkeys
Control sound volume using system-wide hotkeys. Customizable on-screen sound volume indicator will show you the current level.
http://www.softarium.com/soundvolumehotkeys/SoundVolumeHotkeys.exe - 374Kb - Download - Screenshot

Phone spy telephone recording system
automatically record incoming & outgoing telephone calls using sound card; caller ID detection via the same sound card; DTMF keys detection; Auto Gain control; 6 sound cards/12 telephone lines supported; perfect hidding mode.
http://www.phonespy.net/download/PhonespySetupPEEN.exe - 7Mb - Download - Screenshot

Power Mixer
Power Mixer is an advanced Windows audio mixer, a complete replacement for the standard Volume Control. This application lets you easily change the sound volume by simply rotating the mouse wheel or by using keyboard hot keys. It includes an audio mixer with advanced volume controls support, a... It is designed to be especially useful for those who play games, work professionally with sound, or are everyday users. ... By using presets you can change all parameters of sound simultaneously!
http://www.actualsolution.com/bin/Power_Mixer.exe - 462Kb - Download - Screenshot

Audio Zone Trigger
Audio Zone Trigger is a sound detection software. It takes live audio from any input source and enables the computer to react to it in a user-specified manner. The sound-detection system lets you set any number of Triggers that perform any number of user-defined responses (record sound, run a... The triggers can also dynamicaly adap to the environment's sound volume to detect only sound peeks. ... You can set each trigger's sensitivity and actions individually, giving you full control. ... ).
http://www.zonetrigger.com/AudioZoneTriggerInstaller.exe - 3Mb - Download - Screenshot

ZVolume Home 2006
ZVolume Home 2006 is a nice, powerful replacement to the standard Windows Volume Control. It can be vastly customized, including changing its look using skins. ZVolume Home 2006 supports hotkeys and command-line parameters as well as all other functions the standard Windows Volume Control supports. ... Besides allowing you to use your keyboard to adjust your sound card's output, ZVolume Home 2006 can control Winamp, Sonique, the NAD MP3 Player, WPlay (Pro), the Windows CD Player and Microsoft's Internet Explorer 4.
http://download.zvolume.com/zvol2006.exe - 764Kb - Download - Screenshot

Auto Volume Control
Solves the volume control problems for TVs, radio stations, CDs and Public Address systems. Now use your PC as a volume control device which stays between the audio input source (microphone) & the audio output source (speaker) all this software requires is a sound card with a line-in and line-out. ... The volume leveler is particularly convenient if you want to regulate the sound level of your whole-house audio system zones, where it may not be as easy to make volume adjustments. ... But with this Automatic Volume Level Control software, everything you watch will ALWAYS maintain the volume...
http://www.bandwidthsaver.com/downloads/avcdsp01.zip - 3Mb - Download - Screenshot

EWMedia play ActiveX
It can help you to develop a cool video/audio playback system. The EWMedia movie player ActiveX include aspect ratio control,Scrolling banner text on video. It can SnapShot From Movie File and save it to BMP file. It have full sound control and include good audio Equalizer(EQ 10 segment) to easy... It also show sound signal when playing. ... User can select video effect or audio effect when playing. ... Other,It have 12 image effects and 9 audio effects.
http://www.ewcad.com/mplay.exe - 3Mb - Download - Screenshot

!4D AudioPlayer SGLX
THE PROGRAM: ! 4D AudioPlayer SGLX v1. 5 Copyright (c) 2003-2004 by Alex Kheifets, SGLX MathPictures, Inc. INTRODUCTION "! 4D AudioPlayer SGLX" is a program using a powerful "Stereo Base Enhancing Effects System" ("4D") to play usual Audio files and CD Tracks. ... But using the "Stereo Base Enhancing Effects System" make sound better than another traditional systems. ... There is no necessity in connection of a sound card and CD-driver by means of cord. ... THE SYSTEM REQUIREMENTS: 1. ... TRY IT and COMPARE THE SOUND WITH ANOTHER PLAYERS!
http://sglx.web.ur.ru/player/setup.exe - 1Mb - Download - Screenshot