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Yes.
If you use the MESS GUI you will see the supported devices and the supported image types.

Indeed, I just see that the line of code that would bring the cassette data into the machine is commented (I don't know why, that seems correct to me):

http://git.redump.net/cgit.cgi/mess/tree/src/mess/drivers/mc1000.c#n326

// data &= (((cassette_input(state->cassette) < +0.0) << 7) | 0x7f);

(The sound of the cassette becomes 0 or 1, and becomes the most signifying bit of the byte that is served by the selected port.)

It could be me, but I'd kinda expect to see something like:

or

Thanks for reminding me to go upload 0.133 to mess.redump.net

As it happens, I have a CCE MC-1000 at home (doesn't everybody in Wales?). I can try and save out a BASIC "Hello World" program to a WAV file if you want...?

I suppose that would be useful for debugging.

Please do, I don't have any CCE WAV files to test with.

Have you tried to use these (MS-DOS) applications for converting .BAS files into .WAV files?

http://mc-1000.wikispaces.com/Cassete#toc0

Download the .zip file linked by the word "aqui", then you can use the four applications:

BAS2BIN.EXE filename.BAS

From a plain text file containing a BASIC program, generates a filename.BIN containing all the bytes that are to be saved to tape (header, then the tokenized version of the program).

You can get a handful of BASIC programs here.

BIN2WAV.EXE filename.BIN

Generates a filename.WAV file from the .BIN file. The .WAV file generated has an unusual sample rate of 2757 samples/second (instead of 44100 or something like that), tuned to produce .WAV files as small as possible, with one sample per peak or valley. But the sound seems to get distorted in some players. For instance, it plays well in Windows Sound Recorder, but differently in Windows Media Player. (Higher frequency becomes mute.) Would M.E.S.S. read them well?

WAV2BIN.EXE filename.WAV

Analyzes a .WAV file to generate a .BIN file. Accepts files with any sample rate.

LISTBIN.EXE filename.BIN

Lists the BASIC program contained in a .BIN file. It doesn't generate a .BAS file, but you can redirect (>) the output to a file.

NOTE: These applications were made with an old QuickBasic, so file names must have no more than 8 characters.

I tried without success. See my older posting.

Anna, but you did manage to produce a .wav file with the programs, right? That's one thing. That the emulator still can't read the .wav files is another issue. But .wav files will be needed to make the tests, that's why I explained about these applications.

Curt: Why is this line commented in the code?
This prevents the emulator from "hearing" the .wav files. Is the line commented because it generates some error? Does this suggestions from Judge solve the problem?