COM Objects > Effects object > Methods > Effects.EchoApply method

Remarks

Applies an echo effect to the given portion of sound under editing.

This is an echo effect that replays what you have played one or more times after a period of time. It's something like the echoes you might hear shouting against a canyon wall. For reverb effect enable feedback.

A successful call to this method will fire the SoundEditStarted event followed by a number of SoundEditPerc events and finally by the SoundEditDone event.

For further details about methods related to the use of special effects refer to the Effects COM object.

Syntax

[Visual Basic]

control.Effects.EchoApply (

nStartPosition as Long,

nEndPosition as Long,

nAffectedChannel as enumChannelMasks,

fDryMix as Single,

fWetMix as Single,

fFeedback as Single,

fDelay as Single,

bStereo as enumBoolean

) as enumErrorCodes

[C++]

short control.Effects.EchoApply (

long nStartPosition,

long nEndPosition,

short nAffectedChannel,

float fDryMix,

float fWetMix,

float fFeedback,

float fDelay,

short bStereo

);

Parameter

Description

nStartPosition

Start position, expressed in milliseconds, of the affected sound range.

nEndPosition

End position, expressed in milliseconds, of the affected sound range.. If set to -1 the end position will be set to the end of the sound.

nAffectedChannel

Numeric value that determines the combination of affected channels.

Supported values are the following:

Mnemonic constant	Value	Meaning
CHANNEL_MASK_0	1 (0x01)	Channel 0 or left channel
CHANNEL_MASK_1	2 (0x02)	Channel 1 or right channel
CHANNEL_MASK_2	4 (0x04)	Channel 2
CHANNEL_MASK_3	8 (0x08)	Channel 3
CHANNEL_MASK_4	16 (0x10)	Channel 4
CHANNEL_MASK_5	32 (0x20)	Channel 5
CHANNEL_MASK_6	64 (0x40)	Channel 6
CHANNEL_MASK_7	128 (0x80)	Channel 7
CHANNEL_MASK_LEFTS	85 (0x55)	All left channels
CHANNEL_MASK_RIGHTS	170 (0xAA)	All right channels
CHANNEL_MASK_ALL	255 (0xFF)	All available channels

fDryMix

Numeric value representing the Dry (unaffected) signal mix.

Supported values are in the range from -2 to +2.

fWetMix

Numeric value representing the Wet (affected) signal mix.

Supported values are in the range from -2 to +2.

fDelay

Numeric value representing the delay expressed in seconds.

Supported values are in the range from -1 to +1.

bStereo

Boolean value, only allowed with even number of channels, instructs the effect to affect both stereo channels or only single channels.

Supported values are the following:

Mnemonic constant	Value	Meaning
BOOL_FALSE	0	Affect single channels only
BOOL_TRUE	1	Affect both stereo channels

The fDryMix is the volume of input signal and the fWetMix is the volume of delayed signal. The fDelay is the delay time in sec. The fFeedback sets how much delay is feed back to the input (for repeating delays). If bStereo is enabled and a stream has an even number of channels then, each even channels will be echoed to each other.

Below some sample:

	fDryMix	fWetMix	fFeedback	fDelay
Small Echo	0.999	0.999	0.0	0.20
Many Echoes	0.999	0.999	0.7	0.50
Reverse Echoes	0.999	0.999	-0.7	0.80
Robotic Voice	0.500	0.800	0.5	0.10

Return value

Value	Meaning

Negative value	An error occurred (see the LastError property for further error details)
enumErrorCodes.ERR_NOERROR (0)	The call was successful.