Modifiers matching channel:

• linear,
• elastic,
• round,
• current,
• tubular,
• spectral,
• closed,
• wireless,
• natural,
• main,
• single,
• artificial,
• narrow,
• noisy,
• over,
• extraneous,
• shared,
• common,
• logical,
• alternative,
• secure,
• physical,
• same,

Simple categories matching spectral:

• information,
• distortion,
• analysis,
• property,
• attribute,
• quantity,
• component,
• band,
• measure,
• channel,
• behavior,
• line,
• change,
• structure,
• characteristic,
• composition,
• shape,
• sonority,
• range,
• transformation,
• feature,
• artefact,
• energy,
• variation,
• region,
• color,
• parameter,