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For each sounds, he got the IC to play silence after each one has finished.
Are you sure that the length values in the datasheet are wrong?
[gerald] I can only comment on what I measured myself, but the length in this page are close to the one I measured, and indeed shorter than the datasheet value.
The allophone recording I did can be found in this post : http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/amstrad-ssa-1-speech-synthesizer-rom-needed/msg5056/#msg5056 .
Recording was done using a logic analyser capturing the digital output of the SPS256, then postprocessed from PWM to analogue (8 bit signed).
