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Does it also make the noise when your driving with the clutch disengaged, especially noticeable at less than 25mph around about?
Does the noise seem to be coming from the transmission area?
Have you checked the fluid level of the transmission at all?
Thats really not narrowing it down to what could be cause i knew it was from the transmission and how is low oil gonna make a a chatter noise
What does the noise sound like? im assuming a chatter since you mentioned it
If the fluid level of the transmission is low it will make all sorts of problems.
If you just rest your foot on the clutch pedal, pushing it very gentle does the noise immediately go away.
If you put your hand on the slave cylinder / clutch fork while the noise is happening can you feel the chatter?