I just noticed that the read message including filename changes the buffer size like you would expect from replace. Read without the filename keeps the buffer in tact.

Thijs

-- Pasted Max  Patch, click to expand. -- 
Copy all of the following text. Then, in Max, select New From Clipboard.
----------begin_max5_patcher----------
663.3oc4W90aZCCD.+4vmBq7zlDfrc9GYusOGSUUNINTW4XiRb1nqp8y9rcH
PZqgFfBBo8hMb4h8c+tS2c44Id9Yx0zFevO.+B3487DOOqHi.uM+2yuhrNmS
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L5x0.DDBcQlEeI0rubC9sASHT2VH14Pe1SvNGv69HI6IZj+V50Haqy6MlMeU
DXWS2BZihIri+MPGS+sAJ8.qnfJF1euf0XlO1RWnyv3XMG6Uk7Y1iN1APWO6
I9yrmzqGeFS7xjaekrm3aKywT9+VxdvWT6QWI3kI+CPyuSuD
-----------end_max5_patcher-----------