请斑竹帮我翻译一下，很感兴趣就是看不懂！Based on state-variable, constant-Q filters, the T1951 features four fully parametric stereo bands with center frequency, bandwidth and amplitude controls, plus the option to use the low- and high-frequency bands as shelving filters. In addition, you get 12AX7 tubes and our ULTRA-TUBE circuitry, enabling you to selectively add tube warmth to your EQ’d signal.
这是百灵达一个电子管参量均衡器的介绍，是T1951的