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I had never come across the concept of an unvoiced vowel, never mind an unvoiced schwa, but it turns out that it is possible to record such a phenomenon with a spectrogram.

Norman Lass in Contemporary Issues in Experimental Phonetics gives the word commercial as an example: "The /k/ sound appears to be unusually long because of the unvoiced quality of /ə/". Figure 6.18 in this reference is particularly illustrative.

Based on this reference, I would expect the same phenomenon is observed in cut and sub, but I wouldn't expect it is the case for but because b is a voiced consonant.

I had never come across the concept of an unvoiced vowel, never mind an unvoiced schwa, but it turns out that it is possible to record such a phenomenon with a spectrogram.

Norman Lass in Contemporary Issues in Experimental Phonetics gives the word commercial as an example: "The /k/ sound appears to be unusually long because of the unvoiced quality of /ə/". Figure 6.18 in this reference is particularly illustrative.

EDIT

@StoneyB explains in the comments that the unvoiced schwa does not happen with stressed syllables and thus it doesn't happen in but, cut or sub.

I had never come across the concept of an unvoiced vowel, never mind an unvoiced schwa, but it turns out that it is possible to record such a phenomenon with a spectrogram.

Norman Lass in Contemporary Issues in Experimental Phonetics gives the word commercial as an example: "The /k/ sound appears to be unusually long because of the unvoiced quality of /ə/". Figure 6.18 in this reference is particularly illustrative.

Based in this reference, I would expect the same phenomenon is observed in cut and sub, but I wouldn't expect it is the case for but because b is a voiced consonant.

I had never come across the concept of an unvoiced vowel, never mind an unvoiced schwa, but it turns out that it is possible to record such a phenomenon with a spectrogram.

Norman Lass in Contemporary Issues in Experimental Phonetics gives the word commercial as an example: "The /k/ sound appears to be unusually long because of the unvoiced quality of /ə/". Figure 6.18 in this reference is particularly illustrative.

Based on this reference, I would expect the same phenomenon is observed in cut and sub, but I wouldn't expect it is the case for but because b is a voiced consonant.

I had never come across the concept of an unvoiced vowel, never mind an unvoiced schwa, but it turns out that it is possible to record such a phenomenon with a spectrogram.

Norman Lass in Contemporary Issues in Experimental Phonetics gives the word commercial as an example: "The /k/ sound appears to be unusually long because of the unvoiced quality of /ə/". Figure 6.18 in this reference is particularly illustrative.

I had never come across the concept of an unvoiced vowel, never mind an unvoiced schwa, but it turns out that it is possible to record such a phenomenon with a spectrogram.

Norman Lass in Contemporary Issues in Experimental Phonetics gives the word commercial as an example: "The /k/ sound appears to be unusually long because of the unvoiced quality of /ə/". Figure 6.18 in this reference is particularly illustrative.

Based in this reference, I would expect the same phenomenon is observed in cut and sub, but I wouldn't expect it is the case for but because b is a voiced consonant.