I run nodes 2498 and 27333 details as follows

Node: 2498 is off an Alinco DR135MKIII and the radio is in 9600 Baud so audio is from discriminator and modulator. This works great and the settings are:

[usb]

; name=usb

; devicenum=2

devstr=2-1

rxmixerset=875

txmixaset=500

txmixbset=500

rxvoiceadj=0.764955

rxctcssadj=0.500000

txctcssadj=50

rxsquelchadj=500

The second node off the same PC node 27333 is off a Yaesu VX2000 and set up as above to feed flat audio in/ out. The settings have been changed but at best the audio out is so low only if I have the volume on my receiver at 90% I can hear the stations Settings are:

[usb1]

; name=usb1

; devicenum=1

devstr=3-2

rxmixerset=400

txmixaset=600

txmixbset=600

rxvoiceadj=1.549599

rxctcssadj=0.506345

txctcssadj=50

rxsquelchadj=750

I have changed the rxmixerset=600 up to 900 with no great increase.

This is the USB settings:

;

; Usbradio channel driver Configuration File a

;

[general]

[usb]

hdwtype=0 ; Leave this set to 0 for USB sound fobs modified using

; the instructions from usbfob.pdf. Use a setting of

; 1 is for Dingotel/Sph interfaces.

rxboost=1 ; 0 = 20db attenuator inserted, 1= 20db attenuator removed

; Set to 1 for additonal gain if using a low-level receiver output

rxctcssrelax=1 ; reduce talkoff from radios w/o CTCSS Tx HPF

; Do not change this, leave this as a 1

txctcssdefault=110.9 ; default tx ctcss freq, any frequency permitted

rxctcssfreqs=110.9 ; rx ctcss freqs in floating point. must be in table

txctcssfreqs=110.9 ; tx ctcss freqs, any frequency permitted

rxctcssoverride=0 ; Set to 1 or yes to start out in carrier squelch mode

carrierfrom=usbinvert ; no,usb,usbinvert,dsp,vox

; no - no carrier detection at all

; usb - from the COR line on the modified USB sound fob

; usbinvert - from the inverted COR line on the modified USB sound fob

; dsp - from RX noise using dsp techniques

; vox - voice activated from RX audio

ctcssfrom=dsp ; no,usb,dsp

; no - CTCSS decoding, system will be carrier squelch

; usb - CTCSS decoding using input from USB FOB

; (currently not supported)

; dsp - CTCSS decoding using RX audio in DSP.

; rxdemod option must be set to flat for this to work.

rxdemod=flat ; input type from radio: no,speaker,flat

; no - RX audio input not used

; flat - Use RX audio from discriminator (before de-emphasis)

; speaker - use de-emphasized audio

txprelim=yes ; Audio processing on left output channel: no,yes

; no - Audio is not pre-emphasized and limited.

; Suitable for use on a microphone input

; yes - Audio is pre-emphasized and limited.

; Suitable for direct connection to an FM modulator

txlimonly=yes ; Audio limiting with no pre-emphasis on output channel: no,yes

; no - Audio is not limited.

; yes - Audio is limited.

; Suitable for transmitters with no limiting but with pre-emphasis.

txtoctype=notone ; Transmit tone control type: no,phase,notone

; no - CTCSS tone encoding with no hang time

; phase - encode CTCSS and reverse phase

; AKA ("reverse burst") before unkeying TX

; notone - encode CTCSS and stop sending tone before unkeying TX

; AKA ("chicken burst")

txmixa=composite ; Left channel output: no,voice,tone,composite,auxvoice

; no - Do not output anything

; voice - output voice only

; tone - CTCSS tone only

; composite - voice and tone

; auxvoice - auxiliary voice output at headphone level for monitoring

txmixb=composite ; Right channel output: no,voice,tone,composite, auxvoice

; See txmixa above.

invertptt=0 ; Invert PTT 0 = ground to transmit, 1 = open to transmit

; This is the collector lead of the 2n4401 on the modified

; usb sound fob.

; please refer to the howto for the procedure to do this.

duplex=0 ; Full Duplex

;rxondelay=20 ; Uncomment and/or adjust for simplex nodes to eliminate "Ping Ponging"

; or "Relay Racing".

; A positive value here will instruct the usbradio driver to ignore the

; COR line for a specified number of 20mSec intervals following the

; release of PTT. Use this only on simplex nodes, and leave commented

; out for repeaters or other full duplex nodes.

;434.500 setup here onward