Studies of sinewave analogs of speech frustrate attempts to characterize auditory perceptual organization through rules derived from Gestalt principles. In such sentences, the time-varying sinusoids replacing the formants exhibit multiple violations of the simple grouping canons, yet coherence occurs and phonetic impressions are elicited. A sinusoidal "voice" has unnatural timbre, suggesting that auditory organization splits the individual tones into separate perceptual streams at the same time that phonetic organization fuses them into a virtual speech signal. To evaluate this hypothesis, two tests assessed the concurrent availability of auditory forms and phonetic impressions. Phonetic perception was indexed with a measure of lexical verification; auditory form perception was indexed with a measure of verification of a tonal component of a sinewave word. Assessments of phonetic and auditory attributes were obtained singly and concurrently, revealing: 1) phonetic perception impedes auditory form perception even at high performance levels; and 2) phonetic perception and auditory form perception are differently organized concurrent effects of the same sensory cause.