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I`m developing an application to record sound in VC++ for PPC 2003 (ipaq 5550). I start from your example (full-duplex), but i put the syncs procedure (to change the frequency of playback sample in a thread). When I record sound I listen an echo effect the last part of recorded sound is reproduced 2 or tree time, if input level is high echo effect is more perceptible. My recording procedure copy from one loop buffer (5 seconds) to another buffer ( 60 second) using lock and unlock buffer, and after save the second buffer to file.

I try different microphone and to change gain level in windows setting, this change the amount of echo effect but it is always present.

thanks you,
Gianluca

the main settings of my application are:
FSOUND_Init(RECORDRATE, 32, FSOUND_INIT_ACCURATEVULEVELS)
FSOUND_Sample_Alloc(FSOUND_FREE, RECORDLEN, FSOUND_MONO | FSOUND_16BITS , RECORDRATE, 255, 128, 255)

#define RECORD_BUFFER       200
#define RECORD_DELAY_MS     25 //   Increase this value if the sound sounds corrupted or the time between recording  and hearing the result is longer than it should be.. 25
#define RECORD_DELAY_SAMPLES  (RECORDRATE * RECORD_DELAY_MS / 1000)
#define RECORDRATE      44100
#define RECORDLEN       (RECORDRATE * 10)    /*  seconds at RECORDRATE khz */
#define RECORDLENSAVE   (RECORDRATE * 60)
#define RECORDSYNCRO 1000 // default 1000
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