acoustic labs audio editor
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  • General Overview of the Audio Effect Operations
  • Echo / Delay Effect
  • Reverb Effect
  • Chours and Flange Effects
  • Multi-Voice Effect
  • Equalizer
  • Pitch Shift




  • General Overview of the Audio Effect Operations Audio Editor Effects Pulldown

    This section describes the audio effects that can be applied to audio when using the Acoustic Labs Audio Editor. The effects can be applied to a specific section of the audio data or the entire audio file. The effects available include echo, delay, reverb, chorus, flange, multi-voice, equalization and pitch shifting. Much of the information in this section expects that the user is familiar with the waveform navigating techniques of highlighting audio and using markers. These topics are covered in Section 3: The Audio Editor Interface in Detail.




    Echo / Delay

    Audio Editor Echo Dialog The "Echo / Delay" effect can be used to apply an echo sound to audio. By selecting this option from the "Effects" pull down menu the "Echo / Delay" dialog box will appear as shown to the left. The user is given the option of selecting where they wish to apply the effect: To a highlighted section of audio, a section of audio selected between markers or the entire audio file.

    After selecting which section of audio you wish to modify there are four other main settings available to create the exact kind of echo effect you desire. The first setting is the "Dry Volume Level" This allows you to change the level of the original audio. A setting of 0.0 decibels will leave the original audio unchanged, a negative setting will decrease the original volume level and a positive value will increase the original volume level. The next setting, the "Wet Volume Level" allows you to set the volume level of the created echoes. The value given in this setting will be the audio level of the first echo and each subsequent echo will deteriorate by the "Decline Percentage" setting. The final setting is the "Delay in Milliseconds". This setting allows for a delay ranging from 1 to 1,000 milliseconds.

    A few other options to note when using the "Echo / Delay" effect are the "Audio Units", "Presets" and "Lock Left and Right Channels". The "Audio Units" option allows you to choose between decibel and percentage. When adjusting the audio levels you can do so using whichever unit suits you better. The "Presets" control allows you to use and create predefined values. Simply double click on any of the preset names to apply the preset values. To add a new preset value fill in the edit box located below the select box and click "Add". Checking the "Lock Left and Right Channels" checkbox allows both channels to be set identically no matter which slider value is adjusted. This makes setting identical volume levels for both channels easier as you will only have to modify the value for one channel. If this option is not selected you will notice that each channel's slider and level value moves independently. This is necessary when you wish to adjust only one channel's value.



    Reverb

    Audio Editor Reverb Dialog The reverb effect can be used to apply a reverb sound to audio. Reverb is similar to an echo effect except that instead of one echo returning, all reverberated sounds are fed back into the reverb effect so that essentially echoes are created of echoes until the sound dissipates.

    By selecting the "Reverb" option from the "Effects" pull down menu the Reverb Effect dialog box will appear as shown to the right. The user is given the option of selecting where they wish to apply the effect: To a highlighted section of audio, a section of audio selected between markers or the entire audio file.

    After selecting which section of audio you wish to modify there are four other main settings available to create the exact kind of reverb effect you desire. The first setting is the "Dry Volume Level" This allows you to change the level of the original audio. A setting of 0.0 decibels will leave the original audio unchanged, a negative setting will decrease the original volume level and a positive value will increase the original volume level. The next setting, the "Wet Volume Level" allows you to set the volume level of the created echoes. The value given in this setting will be the audio level of the first reverberation and each subsequent reverberation will deteriorate by the "Decline Percentage" setting. The final setting is the "Delay in Milliseconds" which is the amount of time between each reverberation. This setting allows for a time duration ranging from 1 to 1,000 milliseconds.

    A few other options to note when using the reverb effect are the "Audio Units", "Presets" and "Lock Left and Right Channels". The "Audio Units" option allows you to choose between decibel and percentage. When adjusting the audio levels you can do so using whichever unit suits you better. The "Presets" control allows you to use and create predefined values. Simply double click on any of the preset names to apply the preset values. To add a new preset value fill in the edit box located below the select box and click "Add". Checking the "Lock Left and Right Channels" checkbox allows both channels to be set identically no matter which slider value is adjusted. This makes setting identical volume levels for both channels easier as you will only have to modify the value for one channel. If this option is not selected you will notice that each channel's slider and level value moves independently. This is necessary when you wish to adjust only one channel's value.



    Chorus and Flange

    Audio Editor Chorus Dialog The chorus and flange effects can be used to apply a chorus or flange sound to audio. Both chorus and flange are phasing effects. A phasing effect creates a single echo with an initial delay value and a variable delay. The only difference between the two effects is that the chorus effect allows for a larger amount of delay for the added voice compared to the flange effect. By selecting the corresponding option from the "Effects" pull down menu the chorus or flange effect dialog box will appear as shown to the left. The user is given the option of selecting where they wish to apply the effect: To a highlighted section of audio, a section of audio selected between markers or the entire audio file.

    After selecting which section of audio you wish to modify there are six other main settings available to create the exact kind of chorus or flange effect you desire. The first setting is the "Dry Volume Level" This allows you to change the volume level of the original audio. A setting of 0.0 decibels will leave the original audio unchanged, a negative setting will decrease the original volume level and a positive value will increase the original volume level. The next setting, the "Wet Volume Level" allows you to set the volume level of the delayed version of the audio. The base, constant delay value for the delayed version of the audio is labeled as "Delay in Milliseconds" and can range to different sizes for both effects. The variable delay is set as "LFO Delay in Milliseconds" and cannot exceed the base delay value. The variable delay is determined by a LFO (Low Frequency Oscillator). The "LFO Frequency" is used to set the frequency of change for the variable delay. The phase of the LFO can also be set using the "LFO Phase" setting. Adjusting LFO settings is useful when attempting to create very unique sounds.

    A few other options to note when using the chorus / flange effect are the "Audio Units", "Presets" and "Lock Left and Right Channels". The "Audio Units" option allows you to choose decibel and percentage. When adjusting the audio levels you can do so using whichever unit suits you better. The "Presets" control allows you to use and create predefined values. Simply double click on any of the preset names to apply the preset values. To add a new preset value fill in the edit box located below the select box and click "Add". Checking the "Lock Left and Right Channels" checkbox allows both channels to be set identically no matter which slider value is adjusted. This makes setting identical volume levels for both channels easier as you will only have to modify the value for one channel. If this option is not selected you will notice that each channel's slider and level value moves independently. This is necessary when you wish to adjust only one channel's value.



    Multi Voice

    Audio Editor Multi-Voice Dialog The multi-voice effect can be used to create a layered sound by placing multiple copies of the original voice within close proximity to one another. This also produces a simulated chorus effect. By selecting the corresponding option from the "Effects" pull down menu the multi voice effect dialog box will appear as shown to the right. The user is given the option of selecting where they wish to apply the effect: To a highlighted section of audio, a section of audio selected between markers or the entire audio file.

    After selecting which section of audio you wish to apply the multi-voice effect to there are four other main settings available to create the exact kind of effect you desire. The first setting is the "Dry Volume Level" This allows you to change the volume level of the original audio. A setting of 0.0 decibels will leave the original audio unchanged, a negative setting will decrease the original volume level and a positive value will increase the original volume level. The next setting, the "Wet Volume Level" allows you to set the volume level of the additional voices. The third parameter is the amount of delay between each voice and the final parameter is the number of voices you wish to add to the existing audio.

    A few other options to note when using the multi-voice effect are the "Audio Units", "Presets" and "Lock Left and Right Channels". The "Audio Units" option allows you to choose decibel and percentage. When adjusting the audio levels you can do so using whichever unit suits you better. The "Presets" control allows you to use and create predefined values. Simply double click on any of the preset names to apply the preset values. To add a new preset value fill in the edit box located below the select box and click "Add". Checking the "Lock Left and Right Channels" checkbox allows both channels to be set identically no matter which slider value is adjusted. This makes setting identical volume levels for both channels easier as you will only have to modify the value for one channel. If this option is not selected you will notice that each channel's slider and level value moves independently. This is necessary when you wish to adjust only one channel's value.



    Equalizer

    Audio Editor EQ Dialog The equalizer effect can be used to apply equalization to the tone of the audio. By selecting the "Equalizer" option from the "Effects" pull down menu the Equalizer dialog box will appear as shown to the left. The user is given the option of selecting where they wish to apply the effect: To a highlighted section of audio, a section of audio selected between markers or the entire audio file.

    The equalizer effect works very similarly to a graphic equalizer of a typical home stereo. As you can see in the image to the left, there are 10 bands to the equalizer. Each band controls a frequency range of the audio. Simply increase or decrease the level of each scroll control associated with a band to increase or decrease the corresponding frequency range. As you adjust the scroll control you will see the corresponding value change in the "Equalizer Values" section. These values can also be entered manually. Also, by having the "Lock Left and Right Channels" checkbox option selected you can control the equalizer levels of each channel simultaneously. If you would rather have separate equalized levels simply uncheck this option and then select the "Left Channel" or "Right Channel" option to control the channel you wish.

    A few other options to note when using the Equalizer Effect are the "Audio Units", "Slope Type" and "Presets" controls. The "Audio Units" control allows you to select between using decibel values or percentages when making changes to each frequency band. The "Slope Type" controls the type of slope used between frequency bands when two adjacent bands differ in audio levels. The "Presets" control allows you to use and create predefined values. Simply double click on any of the preset names to apply the preset values. To add a new preset value fill in the edit box located below the select box and click "Add".



    Pitch Shift

    Audio Editor Pitch Dialog The Pitch Shift Effect can be used to apply a change in the pitch of the audio. By selecting the "Pitch Shift" option from the "Effects" pull down menu the pitch shift dialog box will appear as shown to the right. The user is given the option of selecting where they wish to apply the effect: A highlighted section of audio, a section of audio selected between markers or the entire audio file.

    The pitch shift effect contains two main settings: The initial pitch and the final pitch. These settings allow the user to change the pitch of the selected audio by a constant amount or a variable amount. Also, the "Units" setting allows the user to select between two different pitch units: semitones and a ratio. When using semitones to change the pitch a positive amount will increase the pitch, a negative amount will decrease the pitch and an amount of 0.0 will leave the pitch unchanged. When changing the pitch using ratio units a ratio of 1.0 will leave the pitch unchanged, a ratio less than 1.0 will decrease the pitch and a ratio greater than 1.0 will increase the pitch.

    The pitch shift effect also allows for setting a different initial and final ratio. Setting different initial and final ratios will result in a change in pitch over the course of the effected audio. For example, if an initial pitch ratio of 0.75 is given and a final ratio of 1.25 is given the initial pitch of the effected region of audio will begin at a lower pitch and then gradually increase to a higher pitch.

    One other options to note when using the Pitch Shift Effect are "Presets". The "Presets" control allows you to use and create predefined values. Simply double click on any of the preset names to apply the preset values. To add a new preset value fill in the edit box located below the "Presets" select box and click "Add".