UZ7HO has released a new version of his great Sound modem software.
Here is part of the version history file, take a look at this file to get to know al the options.
SCM v0.71b changes: - Fixed "Frame Collector" operation with MAXFRAME greater than 4 and IPOLL frames. By default it supports up to 6 frames into collector's buffer now. - Added "TXFrmMode" option (that was available in 9k6/19k2 version). It allows to select the transmission mode of the frames. If set "TXFrmMode=1" then it will repeat only one frame on each of REJ acks. It can be useful in poor condition jointly with MAXFRAME up to 4. If another station uses a TNC which can operate with "Frame Collector" this option can improve a performance, especially on HF. If set "TXFrmMode=0" then it will always repeat the block of the frames, of which the number is limited by MAXFRAME. It can improve the efficiency in good condition. Especially with TNCs without "Frame Collector" function. By default this value is "1".