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Activation1d's anti-alias Kaiser sinc resampling (asymmetric pad_left / pad_right) can produce ±1-2 sample rounding in edge cases, causing the BigVGAN AMPBlock residual addition (xt + x) to fail with a size mismatch. Trim or pad the output to exactly match the input length so the resblock skip connection always has matching dimensions. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>