About Active DJ Studio

Develop ActiveX applications with audio/video playback, sound mixing and playlist management.

Active DJ Studio is an ActiveX control that adds audio/video playback, mixing capabilities and playlists management to multimedia applications. It supports many audio/video formats and uses DirectSound, ASIO and WASAPI which allows players to have a separate control over Volume, Tempo, Playback Rate, Pitch and Equalizer values. Visual feedback is provided through embedded VU-Meter, Spectrum Analyzer, Oscilloscope and Waveform displays.

Active DJ Studio can load different sounds at the same time on different virtual decks, known as "players"; a player can be compared to a physical deck on a DJ console. You can create a console with many virtual decks that can simultaneously play different songs on one or more sound cards. The availability of a certain number of players (decks) will enable the container application to mix several songs on different output channels, giving the ability to play advertising spots while songs are being played/mixed on different output channels. This is very useful for multi-channel radio stations automation software

Each player can have separate volume, tempo, playback rate, pitch and equalizer settings; each player also comes with a set of embedded and configurable visual feedback components such as VU-meter, spectrum analyzer, oscilloscope and waveform.

An embedded automatic fader can easily mix audio tracks loaded inside a playlist with an accurate and configurable fade-in/fade-out.

Brief summary of available features:

Audio playback

  • AAC and AAC+
  • M4A and MP4
  • PCM RAW format
  • AC3
  • MOD Music
  • PVF
  • AIFF
  • Monkey's Audio (APE)
  • Speex
  • ALAC
  • MP3, MP2, MP1
  • SVX
  • AU
  • Musepack
  • VOC
  • CAF (1)
  • NIST
  • W64
  • CD tracks
  • OGG Vorbis
  • WAV (2)
  • FLAC
  • OPUS
  • WavPack
  • PAF
  • WMA and WMV (3)

(1) Support for PCM 8/16/24/32 bits, PCM 32 bits floating point, G711 U-LAW, G711 A-LAW
(2) Support for uncompressed PCM and compressed formats whose ACM codec is installed inside the system 
(3) Require the availability of Windows Media Player modules on the target PC

  • PCM stream queuing, allowing to play sound streams coming from an external source
  • Playback of sound files from memory buffers
  • Custom encryption/decryption of sounds
  • Support for loading and playing sound files, in all of the supported audio formats, from a ZIP file directly, also when the same is AES encrypted

Sound effects

  • Volume control
  • Volume sliding
  • Pre-amplifier
  • Automatic Fader and volume automation with possibility to design volume fading curves
  • Equalizer
  • Auto-equalization of audio tracks through formatted XML files
  • BPM (Beats Per Minute) detection
  • Beats position detection
  • Tempo, Playback rate and Pitch support
  • Configurable normalization of sound level
  • Reverse playback of audio tracks
  • DirectX Media Objects (DMO) effects
  • EAX effects (if supported by the sound card)
  • Custom DSP effects
  • VST effects
  • Common filters (low-pass, high-pass, band-pass and stop-band)
  • Vocal remover filter
  • Real-time DC Offset removal

Sound generator

  • Pure wave tones
  • Composite or monaural wave tones
  • Binaural and multi-channel wave tones
  • Sliding wave tones
  • Noises
  • DTMF tones
  • Text to speech strings

Sound composer

  • Composing of new mono, stereo or multi-channel (up to 7.1) sound files by mixing together audio data taken from the following audio sources:
    • The Microsoft Speech API which allows creating audio data from a string of text or from a text file through synthesized voices
    • Regular sound files stored inside disk files or inside memory buffers


  • Playback of MIDI files
  • SoundFonts management
  • Events management
  • Acquisition of MIDI events from a MIDI input device
  • VST Instruments

Audio streaming to and from the Internet

  • Playback of audio files stored on an Internet server (not available for MOD music files)
  • Playback of Internet radios Shoutcast (versions 1 and 2) Icecast and WMA streams
  • Playback of Internet radios streaming in HLS format (HTTP Live Streaming)
  • Support for acting as a source for ShoutCAST, IceCast and Windows Media Services streaming servers
  • Support for sending to streaming servers (ShoutCAST, IceCast and Windows Media Services), the output of any WASAPI loopback device, allowing to stream any sound being played through an output device also if generated by external and third-party applications

Video playback

  • Playback of video clips whose DirectShow compatible codecs are installed inside the target system, with support for multiple output windows
  • Mixing/blending of video clips inside a video mixer output window, with support for separate preview windows
  • Customizable On-Screen-Display (OSD) on the video mixer window
  • Customizable On-Screen-Display (OSD) on the video player
  • Brightness, contrast, saturation, hue and gamma management of the loaded video clip
  • Full-screen management
  • Extraction of the audio track available inside a video clip, allowing to perform silence detection, BPM detection and waveform analysis

Protocols and sound cards management

  • DirectSound protocol
  • ASIO protocol with the possibility to directly playback the sound stream coming from ASIO input channels of the sound card
  • WASAPI protocol on Windows Vista and higher versions
  • Management of audio endpoints (CoreAudio) on Windows Vista and higher versions
  • Sound card output choice and speakers assignment
  • Support for cloning the audio stream on multiple output devices and speakers

Playlists and sound management

  • Playlists support (M3U, PLS, WPL)
  • New proprietary playlist format (PDJ), allowing to predispose mixing automation and volume automation on each single song and to play encrypted sounds
  • Position triggers management
  • Cue points management
  • Sound waveform analysis
  • Delayed playback of songs

CD management

  • Playback of CD tracks
  • CDDB database queries (through FreeDb servers)
  • CD cover pictures retrieval (through Amazon Web Services)

Graphical features

  • Real-time embedded visual feedbacks (VU-Meter, Oscilloscope, Spectrum, Waveform display)
  • Enhanced graphical spectrum analyzer
  • Graphic bars for custom displaying of Vu-Meters, Spectrum and Progress bars
  • Display of fade-in and fade-out curves applied to the embedded automatic fader
  • Waveform scroller allowing manual and automatic movement of the waveform
  • Support for drawing the waveform representation inside a graphical device context (HDC)
  • Virtual piano keyboard for MIDI management
  • Frames grabbing from video clips
  • Volume curve designer

Tagging features

  • Read of most common frames of the following tag formats (Unicode strings supported):
    • APE
    • FLAC
    • ID3V1
    • ID3V2.2
    • ID3V2.3
    • ID3V2.4
    • LYRICS3
    • MP4
    • OGG Vorbis
  • Read of the following chunks in WAV files: 
    • CART
    • DISP
    • BEXT

Misc features

  • Mixing of songs at an application level, through custom stream mixers, allowing you to save mixing results through the integration with the Audio Sound Recorder for .NET component or to send mixing results to a streaming server
  • Exporting of loaded sound in WAV format (on both disk file or memory buffer)
  • Lyrics synchronization through LRC files
  • Downloading facility allowing the download of remote files into the local system and, in case of media files of supported format, with the option to load them automatically inside a player when download is completed
  • Support for ZIP format with AES encryption/decryption capabilities.
  • Integration with Active Sound Recorder and Active Sound Editor controls