[lpf] add low pass filter per channel

Senior/SeniorModel.cpp

@@ -1,3 +1,5 @@
+#include <ranges>
+
 #include <Gamma/scl.h>
 
 #include "Senior.hpp"
@@ -13,11 +15,15 @@ void Senior::prepare(setup info)
 
   skipped_frames.resize(info.input_channels);
   fms.resize(info.input_channels);
+  lpfs.resize(info.input_channels);
 
-  for (auto& fm : fms)
+  for (auto [fm, lpf] : std::views::zip(fms, lpfs))
   {
     fm.set_sample_rate(info.rate);
     fm.maxDelay(0.1);
+
+    lpf.set_sample_rate(info.rate);
+    lpf.type(gam::LOW_PASS);
   }
 
   phases.resize(info.output_channels);
@@ -98,7 +104,15 @@ void Senior::operator()(tick t)
 
         phases[i] = lfo.phase();
       }
+      else
+        out_frame = current_frame;
 
+      if (inputs.filter < 1.f)
+      {
+        lpfs[i].freq(inputs.filter * 2920. + 80.);
+        out[j] = lpfs[i](out_frame);
+      }
+      else
         out[j] = out_frame;
     }
   }

Senior/SeniorModel.hpp

@@ -5,6 +5,7 @@
 
 #include <Gamma/Oscillator.h>
 #include <Gamma/Delay.h>
+#include <Gamma/Filter.h>
 
 #include <halp/compat/gamma.hpp>
 #include <halp/audio.hpp>
@@ -31,6 +32,7 @@ public:
   {
     halp::dynamic_audio_bus<"Input", double> audio;
     halp::knob_f32<"SAMPLE RATE", halp::range{.min = .1, .max = 1., .init = 1.}> s_rate;
+    halp::knob_f32<"FILTER", halp::range{.min = 0., .max = 1., .init = 1.}> filter;
 
     using log_map = halp::log_mapper<std::ratio<95, 100>>;
     struct : halp::knob_f32<"BITS", halp::range{.min = 3, .max = BITS, .init = BITS}>
@@ -83,6 +85,10 @@ private:
                          gam::ipl::Linear,
                          halp::compat::gamma_domain>> fms;
 
+  std::vector<gam::OnePole<double,
+                           double,
+                           halp::compat::gamma_domain>> lpfs;
+
   void set_bit_factor();
   double crush(const double& f);
 };

Senior/SeniorUi.hpp

@@ -17,6 +17,7 @@ struct Senior::ui
   {
     halp_meta(layout, hbox)
     halp::item<&ins::bits> bits;
+    halp::item<&ins::filter> filter;
     halp::item<&ins::s_rate> s_rate;
   } res;