Confusions between voiced and voiceless plosives and fricatives are the most common confusions in Dutch tracheoesophageal (TE) speech. The problem is attributed to the working of the new voice source: the pharyngo-esophageal segment, or neoglottis. In order to learn how these speakers convey the voiced-voiceless distinction, detailed analyses are necessary. 15 acoustic correlates (and a subset of 6 for the fricatives) were selected and analyzed. Statistical analyses were then used to determine which correlates are used to distinguish between voiced and voiceless sounds. The data show that TE speakers do not differ much from normal laryngeal speakers, except where voicing is concerned.