[StainlessS]

Originally Posted by shekh

After applying ConvertAudioToFloat the audio still appears as 16-bit integer in VirtualDub.
Can it output PCM_FLOAT format? Tried with r2375.

Shekh, is below what you are after ?

OPT_AllowFloatAudio
global OPT_AllowFloatAudio = True  
This option enables WAVE_FORMAT_IEEE_FLOAT audio output. The default is to autoconvert Float audio to 16 bit. 

OPT_UseWaveExtensible
global OPT_UseWaveExtensible = True  
This option enables WAVE_FORMAT_EXTENSIBLE audio output. The default is WAVE_FORMAT_EX.
Note: The default DirectShow component for .AVS files, "AVI/WAV File Source", does not correctly implement WAVE_FORMAT_EXTENSIBLE
processing, so many application may not be able to detect the audio track. There are third party DirectShow readers that do work correctly. 
Intermediate work files written using the AVIFile interface for later DirectShow processing will work correctly if they use the DirectShow "File 
Source (async)" component or equivalent.

OPT_VDubPlanarHack
global OPT_VDubPlanarHack = True   v2.60
This option enables flipped YV24 and YV16 chroma planes. This is an hack for early versions of Virtualdub with YV24/YV16 support.

OPT_dwChannelMask
global OPT_dwChannelMask(int v)   v2.60
This option enables you to set ChannelMask. It overrides WAVEFORMATEXTENSIBLE.dwChannelMask[[1] which is set according to this table
0x00004, // 1   -- -- Cf
0x00003, // 2   Lf Rf
0x00007, // 3   Lf Rf Cf
0x00033, // 4   Lf Rf -- -- Lr Rr
0x00037, // 5   Lf Rf Cf -- Lr Rr
0x0003F, // 5.1 Lf Rf Cf Sw Lr Rr
0x0013F, // 6.1 Lf Rf Cf Sw Lr Rr -- -- Cr
0x0063F, // 7.1 Lf Rf Cf Sw Lr Rr -- -- -- Ls Rs

On Wiki:-
http://avisynth.nl/index.php/Interna...llowFloatAudio

EDIT: Snippet from TwriteAVI doc

See also Avisynth settings for WaveExtensible and Float output for compatible players (otherwise audio may be converted to 16bit on output
from avisynth to a player).

# For Float/WaveExtensible player eg MPC-HC (Else comment out below if Player not capable)
    Global OPT_UseWaveExtensible = (AudioChannels>2||AudioBits>16)      # If more than 2 channels or > 16 bit, set true (Also Float, ie > 16 bits).
    Global OPT_AllowFloatAudio   = (IsAudioFloat)                       # Must be set true to play in eg Media Player Classic - Home Cinema