By Christian Ulrich. ACS is an freeware crossplatform set of components designed to perform different sound-processing tasks. So you can do playing,recording, convert of audio files/streams.

    * Abstract Layer to include different "drivers"
    * Alsa,/dev/dsp,AOLive,OSS support within linux
    * DirectX,Wavemapper support within Windows
    * Audio playback and capture
    * Simultaneous operations on the same or different devices are allowed.
    * Abstract Layer to make it easy to add new Fileformats already included Fileformats:
    * Wave files/streams support, Raw PCM, MS ADPCM, DVI IMA ADPCM support
    * MP3 format support : Encode mp3 files using LAME, mp3 playback with smpeg library streams conversion using MAD decoder
    * Ogg Vorbis format support : Reading Ogg files/streams (including multi-streamed ones).
    * Storing data in Ogg Vorbis format with wide range of settings for compression/quality tweaks.
    * Ogg comments support
    * FLAC format support : Reading FLAC files/streams, Storing data in FLAC format with wide range of settings for compressiontweaks.
    * Monkey Audio format support (for Windows only)
    * CD-ROM playback and direct CDDA data capture
    * Append data to existing file/stream capability
    * AudioMixer component for mixing/concatenating audio streams
    * InputList component for building dynamically playback/input lists
    * Set of audio converter components
    * Sample converter for bits per sample conversion.
    * Sample rate converter (resampler) using sinc filtering
    * Mono/Stereo conveter
    * Stereo balance control
    * Sound indicator
    * Windowed sinc and Butterworth filters for changing audio spectrum
    * Convolver component for applying custom sound effects
    * Mixer component to use mixer devices.


 
Fully functional
Source: Included

By Silhwan Hyun. TBASSPlayer is a Delphi component, which helps you make music players easily with the power of BASS audio library (bass.dll, basswma.dll, bassmidi.dll and basscd.dll). Visit http://www.un4seen.com if you want to know more about BASS audio library. TBASSPlayer can play all the file formats supported by BASS audio library such as

• stream files (WAV, MP3, MP2, MP3, Ogg Vorbis, AIFF, WMA format)
• music files (MOD, MO3, IT, XM, S3M, MTM, MOD, UMX format)
• Winamp 2 DSP plug-ins
• MIDI files (MID, MIDI, RMI, KAR format)
• CD Audio tracks
• URL stream (files from the internet and Shout/Icecast)

TBASSPlayer also supports "BASS add-ons" - plugin modules designed for BASS audio library which enables the playback of additional file formats. TBASSPlayer supports Winamp visualization plug-ins and Winamp DSP plug-ins also without the need of any external library to drive them. So you can enjoy the power of numerous Winamp plug-ins with that of BASS audio library.
 
Fully functional
Source: Included
Exe-Demo Included

By PDJTools. Play Sound Files (*.wav). Your have ability to repeat play sound.
 
Fully functional
Source: Included

The DSMixer component manages playback of audio files enabling per channel control of volume, pan, pitch, fading and also access to each channel's audio data in PCM format while playing.

New Audio Components for Delphi

New Audio Components (NewAC) are designed to help your Delphi programs to perform different sound-processing tasks. With NewAC you can play audio stored in different formats (wav, Ogg Vorbis, FLAC, Monkey Audio, WavPack, MP3, Windows WMA, DTS, AC-3). The playback is performed in the background, and although you application can control it (stop, pause, move forward and backward, play in a loop) it can perform some other tasks while audio plays. You can play sound not only from external files, but also from sound resources embedded into your program, and, in fact, from any stream providing audio data. But NewAC not only allows you to play sound. You can acquire audio data from such input devices as microphone or CD and encode it into any of the audio formats mentioned above. You can also extract multi-channel audio data from CD/DVD images and VOB files. While playing audio stored in a file or while writing audio content to a file you can manipulate tags supported by the chosen audio format. Apart from all that NewAC can perform some audio-editing tasks, like mixing and concatenating audio streams, selecting fragments of streams, performing samle rate and bits per sample conversions.

In other words with NewAC you can perform wide range of audio tasks: from adding audio notifications capability to your program to writing a sophisticated audio-recorder with sound conversion and editing capabilities. And, I just forgot to mention, NewAC is free with source available.

Some of the components, like Ogg Vorbis, FLAC, WAVPack require additioan third party DLLs. You can download them in a precompiled form below.

By Boian Mitov. The OpenWire AudioLab is a set of components, based on OpenWire 3.x for fast audio processing. They allow audio capture, processing and playback with zero lines of program code. AudioLab is a subset of a larger component development project . As the scope of the project expanded the AudioLab was separated as a logical stand alone subset of components for audio processing. AudioLab supports both the old fashion Wave Win32 API, Audio ACM, and the latest DirectX Media Objects (DMO) and DirectShow, and even allows if needed any mixture of them. The developer can choose to go with any of them, to use all, or can switch from the one to the other at any moment. The components hide the complexity of both approaches, and make them look almost identical from the users prospective.