From 17b43c2b87eba43f0f071471b855e0ed659a2627 Mon Sep 17 00:00:00 2001
From: comfyanonymous <121283862+comfyanonymous@users.noreply.github.com>
Date: Thu, 5 Mar 2026 13:31:28 -0800
Subject: [PATCH] LTX audio vae novram fixes. (#12796)

---
 comfy/ldm/lightricks/vocoders/vocoder.py | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/comfy/ldm/lightricks/vocoders/vocoder.py b/comfy/ldm/lightricks/vocoders/vocoder.py
index a0e03cada..2481d8bdd 100644
--- a/comfy/ldm/lightricks/vocoders/vocoder.py
+++ b/comfy/ldm/lightricks/vocoders/vocoder.py
@@ -82,7 +82,7 @@ class LowPassFilter1d(nn.Module):
         _, C, _ = x.shape
         if self.padding:
             x = F.pad(x, (self.pad_left, self.pad_right), mode=self.padding_mode)
-        return F.conv1d(x, self.filter.expand(C, -1, -1), stride=self.stride, groups=C)
+        return F.conv1d(x, comfy.model_management.cast_to(self.filter.expand(C, -1, -1), dtype=x.dtype, device=x.device), stride=self.stride, groups=C)
 
 
 class UpSample1d(nn.Module):
@@ -191,7 +191,7 @@ class Snake(nn.Module):
         self.eps = 1e-9
 
     def forward(self, x):
-        a = self.alpha.unsqueeze(0).unsqueeze(-1)
+        a = comfy.model_management.cast_to(self.alpha.unsqueeze(0).unsqueeze(-1), dtype=x.dtype, device=x.device)
         if self.alpha_logscale:
             a = torch.exp(a)
         return x + (1.0 / (a + self.eps)) * torch.sin(x * a).pow(2)
@@ -218,8 +218,8 @@ class SnakeBeta(nn.Module):
         self.eps = 1e-9
 
     def forward(self, x):
-        a = self.alpha.unsqueeze(0).unsqueeze(-1)
-        b = self.beta.unsqueeze(0).unsqueeze(-1)
+        a = comfy.model_management.cast_to(self.alpha.unsqueeze(0).unsqueeze(-1), dtype=x.dtype, device=x.device)
+        b = comfy.model_management.cast_to(self.beta.unsqueeze(0).unsqueeze(-1), dtype=x.dtype, device=x.device)
         if self.alpha_logscale:
             a = torch.exp(a)
             b = torch.exp(b)
@@ -597,7 +597,7 @@ class _STFTFn(nn.Module):
             y = y.unsqueeze(1)                                # (B, 1, T)
         left_pad = max(0, self.win_length - self.hop_length)  # causal: left-only
         y = F.pad(y, (left_pad, 0))
-        spec = F.conv1d(y, self.forward_basis, stride=self.hop_length, padding=0)
+        spec = F.conv1d(y, comfy.model_management.cast_to(self.forward_basis, dtype=y.dtype, device=y.device), stride=self.hop_length, padding=0)
         n_freqs = spec.shape[1] // 2
         real, imag = spec[:, :n_freqs], spec[:, n_freqs:]
         magnitude = torch.sqrt(real ** 2 + imag ** 2)
@@ -648,7 +648,7 @@ class MelSTFT(nn.Module):
         """
         magnitude, phase = self.stft_fn(y)
         energy = torch.norm(magnitude, dim=1)
-        mel = torch.matmul(self.mel_basis.to(magnitude.dtype), magnitude)
+        mel = torch.matmul(comfy.model_management.cast_to(self.mel_basis, dtype=magnitude.dtype, device=y.device), magnitude)
         log_mel = torch.log(torch.clamp(mel, min=1e-5))
         return log_mel, magnitude, phase, energy