[tebasuna51]

Use the left column for SonicAc3.ini and right column for Sonic in normal mode. The files generated are bitidentical (for me).

[Parameters]         [Soft Encode Settings]
DataRate=448         Data Rate = 448
SampleRate=0         Sample Rate = 48 KHz
CodeMode=7           Audio Coding Mode = 3/2 (L,C,R,l,r)
UseLFE=Off           LFE enable = Checked
                     Bit stream mode = ...Complete Main
DlgNorm=20           Dialog Normalization = -20 dB
NonIntel=Off         Save fr. in Intel byte order = Unchecked
CMix=0               Center Mix level = -3 dB
SurMix=0             Surround Mix level = -3 dB
DolbySurround=0      Dolby Surround mode = Not indicated
                     Copyright bit = Checked
                     Original bit stream = Checked
                     Info exists = Checked
                     Mix levels = 105 dB SPL
                     Room type = Small room, flat monitor
Deemphasis=On        Digital deemphasis = Unchecked
DCFilter=Off         DC high-pass Filter = Checked
BandWidthFilter=Off  BandWidth low-pass Filter = Checked
LFEFilter=Off        LFE low-pass Filter = Checked
Phase90=Off          90 Deegre Phase shift = Checked
Cut3dB=On            3 dB attenuation = Unchecked
CompressionType=0    Compression characteristic = None
RFCmpInUse=On        RF overmodulation protection = Unchecked
TimeStamp=On         Add Time Stamp = Unchecked

Sonic uses the defaults for not supplied parameters, then you need always:
Bit stream mode = ...Complete Main
Copyright bit = Checked
Original bit stream = Checked
Info exists = Checked
Mix levels = 105 dB SPL
Room type = Small room, flat monitor